These plants are known to be native
to south of Lake Pontchartrain:
This list is for research and inspiration. Since so many of us are still learning about our unique regional ecosystems, we thought we'd share this comprehensive resource. Delta Flora couldn't possibly carry every LA native plant... But if there is a plant on this list that you'd like to buy from us at the nursery, we'd be happy to know what you're interested in! You can send us an email at deltaflora504@gmail.com.
| Scientific Name | Common Name | Family Common Name | Growth Habit | Parish | ||
| Abutilon | Indian mallow | Mallow family | LA(Orleans, St. Charles, Terrebonne) | |||
| Acalypha | copperleaf | Spurge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Acalypha gracilens | slender threeseed mercury | Spurge family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Acalypha ostryifolia | pineland threeseed mercury | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Acalypha rhomboidea | common threeseed mercury | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Acalypha setosa | Cuban copperleaf | Spurge family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Acalypha virginica | Virginia threeseed mercury | Spurge family | Forb/herb | LA(Orleans, St. Charles) | ||
| Acer | maple | Maple family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Acer negundo | boxelder | Maple family | Tree | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Acer rubrum | red maple | Maple family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Acer rubrum var. drummondii | Drummond's maple | Maple family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Acer rubrum var. rubrum | red maple | Maple family | Tree | LA(Lafourche, St. Bernard, St. Charles) | ||
| Acer rubrum var. trilobum | red maple | Maple family | Tree | LA(Orleans) | ||
| Achillea | yarrow | Aster family | LA(Orleans, St. Bernard, Terrebonne) | |||
| Achillea millefolium | common yarrow | Aster family | Forb/herb | LA(Orleans, St. Bernard, Terrebonne) | ||
| Achillea millefolium var. occidentalis | western yarrow | Aster family | Forb/herb | LA(Orleans, St. Bernard, Terrebonne) | ||
| Acmella | spotflower | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Acmella oppositifolia | oppositeleaf spotflower | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Acmella oppositifolia var. repens | oppositeleaf spotflower | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Acorus | sweetflag | Calamus family | LA(Orleans) | |||
| Adiantum | maidenhair fern | Maidenhair Fern family | LA(Lafourche, Orleans, St. Charles) | |||
| Adiantum capillus-veneris | common maidenhair | Maidenhair Fern family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Aeschynomene | jointvetch | Pea family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Aeschynomene americana | shyleaf | Pea family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Aeschynomene indica | Indian jointvetch | Pea family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Aesculus | buckeye | Horse-chestnut family | LA(Orleans) | |||
| Aesculus pavia | red buckeye | Horse-chestnut family | Tree, Shrub | LA(Orleans) | ||
| Aesculus pavia var. pavia | red buckeye | Horse-chestnut family | Shrub, Tree | LA(Orleans) | ||
| Agalinis | false foxglove | Figwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Agalinis fasciculata | beach false foxglove | Figwort family | Forb/herb | LA(Jefferson) | ||
| Agalinis heterophylla | prairie false foxglove | Figwort family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Agalinis linifolia | flaxleaf false foxglove | Figwort family | Forb/herb | LA(Orleans) | ||
| Agalinis maritima | saltmarsh false foxglove | Figwort family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Agalinis maritima var. grandiflora | saltmarsh false foxglove | Figwort family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Agalinis obtusifolia | tenlobe false foxglove | Figwort family | Forb/herb | LA(St. Charles) | ||
| Agalinis purpurea | purple false foxglove | Figwort family | Forb/herb | LA(Jefferson, St. Bernard, St. Charles) | ||
| Ageratina | snakeroot | Aster family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Ageratina altissima | white snakeroot | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ageratina aromatica | lesser snakeroot | Aster family | Forb/herb | LA(Orleans) | ||
| Ageratina aromatica var. aromatica | lesser snakeroot | Aster family | Forb/herb | LA(Orleans) | ||
| Agrostis | bentgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Agrostis hyemalis | winter bentgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Allium | onion | Lily family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Allium canadense | meadow garlic | Lily family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Allium canadense var. canadense | meadow garlic | Lily family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Alopecurus | foxtail | Grass family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Alopecurus carolinianus | Carolina foxtail | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Alternanthera | joyweed | Amaranth family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Alternanthera paronychioides | smooth joyweed | Amaranth family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Alternanthera paronychioides var. paronychioides | smooth joyweed | Amaranth family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Amaranthus arenicola | sandhill amaranth | Amaranth family | Forb/herb | LA(Jefferson, Orleans, St. Bernard) | ||
| Amaranthus australis | southern amaranth | Amaranth family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Amaranthus cannabinus | tidalmarsh amaranth | Amaranth family | Forb/herb | LA(Terrebonne) | ||
| Amaranthus greggii | Gregg's amaranth | Amaranth family | Forb/herb | LA(Jefferson) | ||
| Amaranthus hybridus | slim amaranth | Amaranth family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Amaranthus palmeri | carelessweed | Amaranth family | Forb/herb | LA(Jefferson, Orleans) | ||
| Amaranthus retroflexus | redroot amaranth | Amaranth family | Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Amaranthus spinosus | spiny amaranth | Amaranth family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Amaranthus tuberculatus | roughfruit amaranth | Amaranth family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Amaranthus viridis | slender amaranth | Amaranth family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ambrosia | ragweed | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ambrosia artemisiifolia | annual ragweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ambrosia artemisiifolia var. paniculata | annual ragweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ambrosia psilostachya | Cuman ragweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, Terrebonne) | ||
| Ambrosia trifida | great ragweed | Aster family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Amianthium | amianthium | Lily family | LA(Orleans) | |||
| Amianthium muscitoxicum | flypoison | Lily family | Forb/herb | LA(Orleans) | ||
| Ammannia | redstem | Loosestrife family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ammannia auriculata | eared redstem | Loosestrife family | Forb/herb | LA(Terrebonne) | ||
| Ammannia coccinea | valley redstem | Loosestrife family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Ammannia latifolia | pink redstem | Loosestrife family | Forb/herb, Subshrub | LA(St. Bernard) | ||
| Amorpha | false indigo | Pea family | LA(Jefferson, Orleans, St. Charles) | |||
| Amorpha fruticosa | false indigo bush | Pea family | Shrub | LA(Jefferson, Orleans, St. Charles) | ||
| Ampelopsis | peppervine | Grape family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ampelopsis cordata | heartleaf peppervine | Grape family | Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Amphicarpaea | hogpeanut | Pea family | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Amphicarpaea bracteata | American hogpeanut | Pea family | Vine, Forb/herb | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Anagallis | pimpernel | Primrose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Anagallis minima | chaffweed | Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Andropogon | bluestem | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Andropogon glomeratus | bushy bluestem | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Andropogon gyrans | Elliott's bluestem | Grass family | Graminoid | LA(Orleans, St. Bernard) | ||
| Andropogon gyrans var. gyrans | Elliott's bluestem | Grass family | Graminoid | LA(Orleans, St. Bernard) | ||
| Andropogon ternarius | splitbeard bluestem | Grass family | Graminoid | LA(Jefferson) | ||
| Andropogon ternarius var. ternarius | splitbeard bluestem | Grass family | Graminoid | LA(Jefferson) | ||
| Andropogon virginicus | broomsedge bluestem | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Andropogon virginicus var. virginicus | broomsedge bluestem | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Anredera | madieravine | Basella family | LA(Jefferson, Orleans, Terrebonne) | |||
| Apios | groundnut | Pea family | LA(St. Charles, Terrebonne) | |||
| Apios americana | groundnut | Pea family | Vine, Forb/herb | LA(St. Charles, Terrebonne) | ||
| Apocynum | dogbane | Dogbane family | LA(St. Charles) | |||
| Apocynum cannabinum | Indianhemp | Dogbane family | Forb/herb | LA(St. Charles) | ||
| Aralia | spikenard | Ginseng family | LA(Terrebonne) | |||
| Aralia spinosa | devil's walkingstick | Ginseng family | Tree, Shrub | LA(Terrebonne) | ||
| Ardisia | marlberry | Myrsine family | LA(Terrebonne) | |||
| Arenaria | sandwort | Pink family | LA(Jefferson, Lafourche, Orleans) | |||
| Arenaria lanuginosa | spreading sandwort | Pink family | Forb/herb | LA(Orleans) | ||
| Arenaria lanuginosa ssp. lanuginosa | spreading sandwort | Pink family | Forb/herb | LA(Orleans) | ||
| Arenaria lanuginosa ssp. lanuginosa var. lanuginosa | spreading sandwort | Pink family | Forb/herb | LA(Orleans) | ||
| Argemone | pricklypoppy | Poppy family | LA(Jefferson, Orleans, Terrebonne) | |||
| Argemone albiflora | bluestem pricklypoppy | Poppy family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Argemone mexicana | Mexican pricklypoppy | Poppy family | Forb/herb | LA(Orleans) | ||
| Arisaema | Jack in the pulpit | Arum family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Arisaema dracontium | green dragon | Arum family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Aristida | threeawn | Grass family | LA(Lafourche, Orleans) | |||
| Aristida longespica | slimspike threeawn | Grass family | Graminoid | LA(Lafourche, Orleans) | ||
| Aristida longespica var. geniculata | slimspike threeawn | Grass family | Graminoid | LA(Lafourche, Orleans) | ||
| Artemisia | sagebrush | Aster family | LA(Orleans, St. Charles, Terrebonne) | |||
| Artemisia ludoviciana ssp. ludoviciana | white sagebrush | Aster family | Subshrub, Forb/herb | LA(Terrebonne) | ||
| Arundinaria | cane | Grass family | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Arundinaria gigantea | giant cane | Grass family | Subshrub, Shrub, Graminoid | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Asclepias | milkweed | Milkweed family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Asclepias incarnata | swamp milkweed | Milkweed family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Asclepias incarnata ssp. incarnata | swamp milkweed | Milkweed family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Asclepias lanceolata | fewflower milkweed | Milkweed family | Forb/herb | LA(St. Charles) | ||
| Asclepias perennis | aquatic milkweed | Milkweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Asplenium | spleenwort | Spleenwort family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Asplenium platyneuron | ebony spleenwort | Spleenwort family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Athyrium | ladyfern | Wood Fern family | LA(Orleans) | |||
| Athyrium filix-femina | common ladyfern | Wood Fern family | Forb/herb | LA(Orleans) | ||
| Athyrium filix-femina ssp. asplenioides | asplenium ladyfern | Wood Fern family | Forb/herb | LA(Orleans) | ||
| Atriplex | saltbush | Goosefoot family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Atriplex cristata | crested saltbush | Goosefoot family | Forb/herb, Shrub, Subshrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Avicennia | mangrove | Verbena family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Avicennia germinans | black mangrove | Verbena family | Tree, Shrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Axonopus | carpetgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Axonopus compressus | broadleaf carpetgrass | Grass family | Graminoid | LA(Orleans) | ||
| Axonopus fissifolius | common carpetgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Axonopus furcatus | big carpetgrass | Grass family | Graminoid | LA(Orleans, St. Charles) | ||
| Azolla | mosquitofern | Azolla family | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Azolla caroliniana | Carolina mosquitofern | Azolla family | Forb/herb | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Baccharis | baccharis | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Baccharis angustifolia | saltwater false willow | Aster family | Shrub | LA(Orleans, St. Bernard, Terrebonne) | ||
| Baccharis halimifolia | eastern baccharis | Aster family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Bacopa | waterhyssop | Figwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Bacopa monnieri | herb of grace | Figwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Bacopa repens | creeping waterhyssop | Figwort family | Forb/herb | LA(Orleans) | ||
| Bacopa rotundifolia | disk waterhyssop | Figwort family | Forb/herb | LA(Orleans) | ||
| Batis | turtleweed | Saltwort family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Batis maritima | turtleweed | Saltwort family | Subshrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Berchemia | supplejack | Buckthorn family | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | |||
| Berchemia scandens | Alabama supplejack | Buckthorn family | Vine | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | ||
| Betula | birch | Birch family | LA(Orleans) | |||
| Betula nigra | river birch | Birch family | Tree | LA(Orleans) | ||
| Bidens | beggarticks | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Bidens bipinnata | Spanish needles | Aster family | Forb/herb | LA(Jefferson, St. Charles, Terrebonne) | ||
| Bidens cernua | nodding beggartick | Aster family | Forb/herb | LA(St. Charles, Terrebonne) | ||
| Bidens discoidea | small beggarticks | Aster family | Forb/herb | LA(Orleans) | ||
| Bidens frondosa | devil's beggartick | Aster family | Forb/herb | LA(St. Charles) | ||
| Bidens laevis | smooth beggartick | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Bidens tripartita | threelobe beggarticks | Aster family | Forb/herb | LA(Orleans) | ||
| Bignonia | bignonia | Trumpet-creeper family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Bignonia capreolata | crossvine | Trumpet-creeper family | Vine | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Blutaparon | blutaparon | Amaranth family | LA(Jefferson, Lafourche, Terrebonne) | |||
| Blutaparon vermiculare | silverhead | Amaranth family | Forb/herb | LA(Jefferson, Lafourche, Terrebonne) | ||
| Boehmeria | false nettle | Nettle family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Boehmeria cylindrica | smallspike false nettle | Nettle family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Boerhavia | spiderling | Four o'clock family | LA(Jefferson, Lafourche, Orleans, St. Charles) | |||
| Boerhavia diffusa | red spiderling | Four o'clock family | Forb/herb | LA(Jefferson, Orleans) | ||
| Boerhavia erecta | erect spiderling | Four o'clock family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Bolboschoenus robustus | sturdy bulrush | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Boltonia | doll's daisy | Aster family | LA(Jefferson, St. Bernard, St. Charles, Terrebonne) | |||
| Boltonia asteroides | white doll's daisy | Aster family | Forb/herb | LA(Terrebonne) | ||
| Boltonia asteroides var. asteroides | white doll's daisy | Aster family | Forb/herb | LA(Terrebonne) | ||
| Boltonia diffusa | smallhead doll's daisy | Aster family | Forb/herb | LA(Jefferson, St. Bernard, St. Charles) | ||
| Boltonia diffusa var. diffusa | smallhead doll's daisy | Aster family | Forb/herb | LA(Jefferson, St. Bernard, St. Charles) | ||
| Borrichia | seaside tansy | Aster family | LA(Jefferson, Lafourche, St. Bernard) | |||
| Borrichia frutescens | bushy seaside tansy | Aster family | Subshrub | LA(Jefferson, Lafourche, St. Bernard) | ||
| Bothriochloa | beardgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Bothriochloa hybrida | hybrid beardgrass | Grass family | Graminoid | LA(Jefferson, Orleans) | ||
| Bothriochloa laguroides | silver beardgrass | Grass family | Graminoid | LA(Lafourche, Orleans) | ||
| Bothriochloa laguroides ssp. torreyana | silver beardgrass | Grass family | Graminoid | LA(Lafourche, Orleans) | ||
| Bothriochloa longipaniculata | longspike beardgrass | Grass family | Graminoid | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Botrychium | grapefern | Adder's-tongue family | LA(St. Bernard, Terrebonne) | |||
| Botrychium biternatum | sparselobe grapefern | Adder's-tongue family | Forb/herb | LA(St. Bernard, Terrebonne) | ||
| Bowlesia | bowlesia | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | |||
| Bowlesia incana | hoary bowlesia | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Brasenia | brasenia | Water-shield family | LA(Lafourche) | |||
| Brasenia schreberi | watershield | Water-shield family | Forb/herb | LA(Lafourche) | ||
| Bromus | brome | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Bromus pubescens | hairy woodland brome | Grass family | Graminoid | LA(Orleans) | ||
| Brunnichia | buckwheat vine | Buckwheat family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Brunnichia ovata | American buckwheat vine | Buckwheat family | Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Buchnera | bluehearts | Figwort family | LA(Jefferson) | |||
| Buchnera americana | American bluehearts | Figwort family | Forb/herb | LA(Jefferson) | ||
| Bulbostylis | hairsedge | Sedge family | LA(Orleans, St. Charles) | |||
| Bulbostylis ciliatifolia | capillary hairsedge | Sedge family | Graminoid | LA(Orleans) | ||
| Bupleurum | bupleurum | Carrot family | LA(Orleans) | |||
| Cabomba | fanwort | Water-shield family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Cabomba caroliniana | Carolina fanwort | Water-shield family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Cabomba caroliniana var. caroliniana | Carolina fanwort | Water-shield family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Caesalpinia | nicker | Pea family | LA(Lafourche) | |||
| Caesalpinia bonduc | yellow nicker | Pea family | Shrub, Vine | LA(Lafourche) | ||
| Cakile | searocket | Mustard family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Cakile constricta | Gulf Coast searocket | Mustard family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Cakile geniculata | gulf searocket | Mustard family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Cakile lanceolata | coastal searocket | Mustard family | Subshrub, Forb/herb | LA(St. Bernard) | ||
| Cakile lanceolata ssp. fusiformis | coastal searocket | Mustard family | Subshrub, Forb/herb | LA(St. Bernard) | ||
| Callicarpa | beautyberry | Verbena family | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | |||
| Callicarpa americana | American beautyberry | Verbena family | Shrub | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Callisia | roseling | Spiderwort family | LA(Orleans) | |||
| Callitriche | water-starwort | Water-starwort family | LA(Orleans, Terrebonne) | |||
| Callitriche pedunculosa | Nuttall's water-starwort | Water-starwort family | Forb/herb | LA(Orleans) | ||
| Callitriche peploides | matted water-starwort | Water-starwort family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Calopogon | grasspink | Orchid family | LA(Lafourche) | |||
| Calopogon tuberosus | tuberous grasspink | Orchid family | Forb/herb | LA(Lafourche) | ||
| Calopogon tuberosus var. tuberosus | tuberous grasspink | Orchid family | Forb/herb | LA(Lafourche) | ||
| Calystegia | false bindweed | Morning-glory family | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Calystegia sepium | hedge false bindweed | Morning-glory family | Forb/herb, Vine | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Campsis | campsis | Trumpet-creeper family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Campsis radicans | trumpet creeper | Trumpet-creeper family | Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Canna | canna | Canna family | LA(Jefferson, Lafourche, Orleans, St. Charles) | |||
| Canna flaccida | bandanna of the Everglades | Canna family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Canna glauca | maraca amarilla | Canna family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Capsicum | pepper | Potato family | LA(St. Charles) | |||
| Capsicum annuum | cayenne pepper | Potato family | Subshrub, Forb/herb | LA(St. Charles) | ||
| Capsicum annuum var. glabriusculum | cayenne pepper | Potato family | Subshrub, Forb/herb | LA(St. Charles) | ||
| Cardamine | bittercress | Mustard family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cardamine bulbosa | bulbous bittercress | Mustard family | Forb/herb | LA(Orleans) | ||
| Cardamine parviflora | sand bittercress | Mustard family | Forb/herb | LA(Orleans, St. Bernard, St. Charles) | ||
| Cardamine parviflora var. arenicola | sand bittercress | Mustard family | Forb/herb | LA(Orleans, St. Bernard, St. Charles) | ||
| Cardamine pensylvanica | Pennsylvania bittercress | Mustard family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cardiospermum | balloonvine | Soapberry family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Carex | sedge | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Carex alata | broadwing sedge | Sedge family | Graminoid | LA(Jefferson, St. Charles) | ||
| Carex albolutescens | greenwhite sedge | Sedge family | Graminoid | LA(St. Bernard, St. Charles) | ||
| Carex amphibola | eastern narrowleaf sedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Carex basiantha | Willdenow's sedge | Sedge family | Graminoid | LA(Orleans) | ||
| Carex blanda | eastern woodland sedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Carex cephalophora | oval-leaf sedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Carex cherokeensis | Cherokee sedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Carex comosa | longhair sedge | Sedge family | Graminoid | LA(Lafourche, St. Charles, Terrebonne) | ||
| Carex complanata | hirsute sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Carex crinita | fringed sedge | Sedge family | Graminoid | LA(Orleans) | ||
| Carex crinita var. brevicrinis | fringed sedge | Sedge family | Graminoid | LA(Orleans) | ||
| Carex crus-corvi | ravenfoot sedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Carex debilis | white edge sedge | Sedge family | Graminoid | LA(Orleans) | ||
| Carex debilis var. debilis | white edge sedge | Sedge family | Graminoid | LA(Orleans) | ||
| Carex festucacea | fescue sedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Carex flaccosperma | thinfruit sedge | Sedge family | Graminoid | LA(Jefferson) | ||
| Carex frankii | Frank's sedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Carex gigantea | giant sedge | Sedge family | Graminoid | LA(Lafourche, Orleans, Terrebonne) | ||
| Carex glaucescens | southern waxy sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Carex hyalinolepis | shoreline sedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Carex leavenworthii | Leavenworth's sedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Carex longii | Long's sedge | Sedge family | Graminoid | LA(Jefferson, Orleans) | ||
| Carex louisianica | Louisiana sedge | Sedge family | Graminoid | LA(Orleans, St. Charles) | ||
| Carex lupulina | hop sedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Carex lurida | shallow sedge | Sedge family | Graminoid | LA(Jefferson) | ||
| Carex muehlenbergii | Muhlenberg's sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Carex muehlenbergii var. muehlenbergii | Muhlenberg's sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Carex oxylepis | sharpscale sedge | Sedge family | Graminoid | LA(Terrebonne) | ||
| Carex oxylepis var. oxylepis | sharpscale sedge | Sedge family | Graminoid | LA(Terrebonne) | ||
| Carex reniformis | kidneyshape sedge | Sedge family | Graminoid | LA(Lafourche) | ||
| Carex triangularis | eastern fox sedge | Sedge family | Graminoid | LA(Jefferson) | ||
| Carex tribuloides | blunt broom sedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Carex vulpinoidea | fox sedge | Sedge family | Graminoid | LA(St. Bernard, St. Charles) | ||
| Carex vulpinoidea var. vulpinoidea | fox sedge | Sedge family | Graminoid | LA(St. Bernard, St. Charles) | ||
| Carpinus | hornbeam | Birch family | LA(Orleans, Terrebonne) | |||
| Carpinus caroliniana | American hornbeam | Birch family | Tree, Shrub | LA(Orleans, Terrebonne) | ||
| Carpinus caroliniana ssp. caroliniana | American hornbeam | Birch family | Tree, Shrub | LA(Orleans, Terrebonne) | ||
| Carya | hybrid hickory | Walnut family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Carya aquatica | water hickory | Walnut family | Tree | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Carya illinoinensis | pecan | Walnut family | Tree | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Castilleja | Indian paintbrush | Figwort family | LA(Jefferson) | |||
| Castilleja indivisa | entireleaf Indian paintbrush | Figwort family | Forb/herb | LA(Jefferson) | ||
| Catalpa | catalpa | Trumpet-creeper family | LA(Lafourche, Orleans, Terrebonne) | |||
| Catalpa bignonioides | southern catalpa | Trumpet-creeper family | Tree | LA(Lafourche, Orleans, Terrebonne) | ||
| Celosia | cock's comb | Amaranth family | LA(Lafourche) | |||
| Celtis | hackberry | Elm family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Celtis laevigata | sugarberry | Elm family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Celtis laevigata var. laevigata | sugarberry | Elm family | Shrub, Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cenchrus | sandbur | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cenchrus echinatus | southern sandbur | Grass family | Graminoid | LA(Jefferson, Orleans, Terrebonne) | ||
| Cenchrus myosuroides | big sandbur | Grass family | Graminoid | LA(Jefferson, Terrebonne) | ||
| Cenchrus spinifex | coastal sandbur | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Cenchrus tribuloides | sanddune sandbur | Grass family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Centaurea | knapweed | Aster family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Centella | centella | Carrot family | LA(Jefferson, Orleans, Terrebonne) | |||
| Centella erecta | erect centella | Carrot family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Centrosema | butterfly pea | Pea family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Centrosema virginianum | spurred butterfly pea | Pea family | Vine, Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Cephalanthus | buttonbush | Madder family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cephalanthus occidentalis | common buttonbush | Madder family | Shrub, Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cerastium | mouse-ear chickweed | Pink family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ceratophyllum | hornwort | Hornwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ceratophyllum demersum | coon's tail | Hornwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ceratophyllum echinatum | spineless hornwort | Hornwort family | Forb/herb | LA(St. Charles, Terrebonne) | ||
| Ceratopteris | antlerfern | Water Fern family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Ceratopteris pteridoides | floating antlerfern | Water Fern family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Ceratopteris richardii | triangle waterfern | Water Fern family | Forb/herb | LA(Lafourche, Orleans) | ||
| Ceratopteris thalictroides | watersprite | Water Fern family | Forb/herb | LA(Jefferson, Terrebonne) | ||
| Cercis | redbud | Pea family | LA(Orleans, St. Charles) | |||
| Cercis canadensis | eastern redbud | Pea family | Tree, Shrub | LA(Orleans, St. Charles) | ||
| Cercis canadensis var. canadensis | eastern redbud | Pea family | Tree, Shrub | LA(Orleans, St. Charles) | ||
| Chaerophyllum | chervil | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Chaerophyllum tainturieri | hairyfruit chervil | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Chamaecrista | sensitive pea | Pea family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Chamaecrista fasciculata | partridge pea | Pea family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Chamaecrista fasciculata var. fasciculata | partridge pea | Pea family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Chamaecrista nictitans | sensitive partridge pea | Pea family | Subshrub, Forb/herb | LA(Orleans) | ||
| Chamaecrista nictitans ssp. nictitans | sensitive partridge pea | Pea family | Subshrub, Forb/herb | LA(Orleans) | ||
| Chamaecrista nictitans ssp. nictitans var. nictitans | sensitive partridge pea | Pea family | Forb/herb, Subshrub | LA(Orleans) | ||
| Chamaesyce | sandmat | Spurge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Chamaesyce bombensis | dixie sandmat | Spurge family | Forb/herb | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Chamaesyce cordifolia | heartleaf sandmat | Spurge family | Forb/herb | LA(Jefferson) | ||
| Chamaesyce glyptosperma | ribseed sandmat | Spurge family | Forb/herb | LA(Jefferson, Terrebonne) | ||
| Chamaesyce hirta | pillpod sandmat | Spurge family | Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Chamaesyce humistrata | spreading sandmat | Spurge family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Chamaesyce hypericifolia | graceful sandmat | Spurge family | Forb/herb, Subshrub | LA(Jefferson, Orleans) | ||
| Chamaesyce hyssopifolia | hyssopleaf sandmat | Spurge family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Chamaesyce maculata | spotted sandmat | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Chamaesyce nutans | eyebane | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Chamaesyce ophthalmica | Florida hammock sandmat | Spurge family | Forb/herb | LA(Terrebonne) | ||
| Chamaesyce prostrata | prostrate sandmat | Spurge family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Chamaesyce serpens | matted sandmat | Spurge family | Forb/herb | LA(Jefferson) | ||
| Chamaesyce thymifolia | gulf sandmat | Spurge family | Forb/herb | LA(St. Bernard) | ||
| Chaptalia | sunbonnetts | Aster family | LA(Orleans) | |||
| Chaptalia tomentosa | woolly sunbonnets | Aster family | Forb/herb | LA(Orleans) | ||
| Chasmanthium | woodoats | Grass family | LA(Lafourche) | |||
| Chasmanthium latifolium | Indian woodoats | Grass family | Graminoid | LA(Lafourche) | ||
| Chasmanthium laxum | slender woodoats | Grass family | Graminoid | LA(Lafourche) | ||
| Chenopodium | goosefoot | Goosefoot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Chenopodium album | lambsquarters | Goosefoot family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Chenopodium berlandieri | pitseed goosefoot | Goosefoot family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Chenopodium berlandieri var. boscianum | pitseed goosefoot | Goosefoot family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Chionanthus | fringetree | Olive family | LA(Orleans) | |||
| Chionanthus virginicus | white fringetree | Olive family | Tree, Shrub | LA(Orleans) | ||
| Chloris | windmill grass | Grass family | LA(Jefferson, Orleans) | |||
| Chloris virgata | feather fingergrass | Grass family | Graminoid | LA(Orleans) | ||
| Chromolaena | thoroughwort | Aster family | LA(Lafourche, Terrebonne) | |||
| Chromolaena ivifolia | ivyleaf thoroughwort | Aster family | Forb/herb, Subshrub | LA(Lafourche, Terrebonne) | ||
| Chrysopsis | goldenaster | Aster family | LA(Terrebonne) | |||
| Chrysopsis texana | Texas chrysopsis | Aster family | Forb/herb | LA(Terrebonne) | ||
| Cicuta | water hemlock | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cicuta maculata | spotted water hemlock | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cirsium | thistle | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cirsium discolor | field thistle | Aster family | Forb/herb | LA(Terrebonne) | ||
| Cirsium horridulum | yellow thistle | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cirsium horridulum var. horridulum | yellow thistle | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cissus | treebine | Grape family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Cissus trifoliata | sorrelvine | Grape family | Vine | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Cladium | sawgrass | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cladium mariscus | swamp sawgrass | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cladium mariscus ssp. jamaicense | Jamaica swamp sawgrass | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Clematis | leather flower | Buttercup family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Clematis crispa | swamp leather flower | Buttercup family | Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Clematis virginiana | devil's darning needles | Buttercup family | Vine | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Cleome | spiderflower | Caper family | LA(Orleans, St. Charles, Terrebonne) | |||
| Clinopodium | clinopodium | Mint family | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Clinopodium brownei | Browne's savory | Mint family | Forb/herb | LA(Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Clitoria | pigeonwings | Pea family | LA(Orleans) | |||
| Clitoria mariana | Atlantic pigeonwings | Pea family | Vine, Forb/herb | LA(Orleans) | ||
| Cocculus | coralbead | Moonseed family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Cocculus carolinus | Carolina coralbead | Moonseed family | Vine | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Commelina | dayflower | Spiderwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Commelina diffusa | climbing dayflower | Spiderwort family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Commelina diffusa var. diffusa | climbing dayflower | Spiderwort family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Commelina erecta | whitemouth dayflower | Spiderwort family | Forb/herb | LA(Jefferson, Orleans) | ||
| Commelina virginica | Virginia dayflower | Spiderwort family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Conioselinum | hemlockparsley | Carrot family | LA(Orleans) | |||
| Conioselinum chinense | eastern hemlockparsley | Carrot family | Forb/herb | LA(Orleans) | ||
| Conoclinium | thoroughwort | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Conoclinium coelestinum | blue mistflower | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Convolvulus | bindweed | Morning-glory family | LA(Orleans) | |||
| Conyza | horseweed | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Conyza canadensis | Canadian horseweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Conyza canadensis var. canadensis | Canadian horseweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Conyza canadensis var. pusilla | Canadian horseweed | Aster family | Forb/herb | LA(St. Bernard) | ||
| Corchorus | corchorus | Linden family | LA(Lafourche, Orleans) | |||
| Coreopsis | tickseed | Aster family | LA(Jefferson, Orleans, St. Charles) | |||
| Coreopsis grandiflora | largeflower tickseed | Aster family | Forb/herb | LA(St. Charles) | ||
| Coreopsis grandiflora var. grandiflora | largeflower tickseed | Aster family | Forb/herb | LA(St. Charles) | ||
| Coreopsis tinctoria | golden tickseed | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Coreopsis tinctoria var. tinctoria | golden tickseed | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Cornus | dogwood | Dogwood family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cornus drummondii | roughleaf dogwood | Dogwood family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cornus florida | flowering dogwood | Dogwood family | Tree, Shrub | LA(Orleans) | ||
| Cornus foemina | stiff dogwood | Dogwood family | Tree, Shrub | LA(Jefferson, Lafourche, St. Charles) | ||
| Corydalis | fumewort | Fumitory family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Corydalis micrantha | smallflower fumewort | Fumitory family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Corydalis micrantha ssp. australis | smallflower fumewort | Fumitory family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Corydalis micrantha ssp. micrantha | smallflower fumewort | Fumitory family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Crassula | pygmyweed | Stonecrop family | LA(Jefferson) | |||
| Crassula aquatica | water pygmyweed | Stonecrop family | Forb/herb | LA(Jefferson) | ||
| Crataegus | hawthorn | Rose family | LA(Jefferson, Lafourche, Orleans, St. Charles) | |||
| Crataegus marshallii | parsley hawthorn | Rose family | Tree, Shrub | LA(Orleans) | ||
| Crataegus spathulata | littlehip hawthorn | Rose family | Tree, Shrub | LA(Orleans) | ||
| Crataegus viridis | green hawthorn | Rose family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Crataegus viridis var. viridis | green hawthorn | Rose family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Crepis | hawksbeard | Aster family | LA(Orleans) | |||
| Crinum | swamplily | Lily family | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Crinum americanum | seven sisters | Lily family | Forb/herb | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Crotalaria | rattlebox | Pea family | LA(Jefferson) | |||
| Croton | croton | Spurge family | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | |||
| Croton capitatus | hogwort | Spurge family | Forb/herb | LA(St. Charles, Terrebonne) | ||
| Croton capitatus var. lindheimeri | Lindheimer's hogwort | Spurge family | Forb/herb | LA(St. Charles, Terrebonne) | ||
| Croton glandulosus | vente conmigo | Spurge family | Subshrub, Forb/herb | LA(Jefferson, St. Charles, Terrebonne) | ||
| Croton lindheimerianus | threeseed croton | Spurge family | Forb/herb | LA(Terrebonne) | ||
| Croton lindheimerianus var. lindheimerianus | threeseed croton | Spurge family | Forb/herb | LA(Terrebonne) | ||
| Croton punctatus | gulf croton | Spurge family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Ctenitis | lacefern | Wood Fern family | LA(Terrebonne) | |||
| Ctenitis submarginalis | brownhair lacefern | Wood Fern family | Forb/herb | LA(Terrebonne) | ||
| Cucurbita | gourd | Cucumber family | LA(Jefferson) | |||
| Cucurbita pepo | field pumpkin | Cucumber family | Vine, Forb/herb | LA(Jefferson) | ||
| Cuphea | waxweed | Loosestrife family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cuscuta | dodder | Dodder family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cuscuta compacta | compact dodder | Dodder family | Forb/herb, Vine | LA(Orleans) | ||
| Cuscuta compacta var. compacta | compact dodder | Dodder family | Vine, Forb/herb | LA(Orleans) | ||
| Cuscuta gronovii | scaldweed | Dodder family | Forb/herb, Vine | LA(Orleans, St. Charles, Terrebonne) | ||
| Cuscuta indecora | bigseed alfalfa dodder | Dodder family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cuscuta indecora var. neuropetala | bigseed dodder | Dodder family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cuscuta pentagona | fiveangled dodder | Dodder family | Forb/herb, Vine | LA(Jefferson, Orleans, Terrebonne) | ||
| Cuscuta pentagona var. pentagona | fiveangled dodder | Dodder family | Forb/herb, Vine | LA(Jefferson, Orleans, Terrebonne) | ||
| Cymodocea | cymodocea | Manatee-grass family | LA(St. Bernard) | |||
| Cymodocea filiformis | manatee grass | Manatee-grass family | Forb/herb | LA(St. Bernard) | ||
| Cynanchum | swallow-wort | Milkweed family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cynanchum angustifolium | gulf coast swallow-wort | Milkweed family | Forb/herb, Vine | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Cynanchum laeve | honeyvine | Milkweed family | Vine, Forb/herb | LA(Orleans, St. Charles) | ||
| Cyperus | flatsedge | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Cyperus acuminatus | tapertip flatsedge | Sedge family | Graminoid | LA(St. Bernard) | ||
| Cyperus articulatus | jointed flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Cyperus compressus | poorland flatsedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Cyperus croceus | Baldwin's flatsedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Cyperus distinctus | swamp flatsedge | Sedge family | Graminoid | LA(Orleans, St. Charles) | ||
| Cyperus echinatus | globe flatsedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Cyperus elegans | royal flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyperus erythrorhizos | redroot flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyperus esculentus | yellow nutsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyperus filicinus | fern flatsedge | Sedge family | Graminoid | LA(Jefferson) | ||
| Cyperus flavescens | yellow flatsedge | Sedge family | Graminoid | LA(Orleans) | ||
| Cyperus haspan | haspan flatsedge | Sedge family | Graminoid | LA(Orleans, St. Bernard, Terrebonne) | ||
| Cyperus lecontei | Le Conte's flatsedge | Sedge family | Graminoid | LA(Orleans) | ||
| Cyperus lupulinus | Great Plains flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Cyperus lupulinus ssp. lupulinus | Great Plains flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Cyperus ochraceus | pond flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard) | ||
| Cyperus odoratus | fragrant flatsedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyperus oxylepis | sharpscale flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyperus polystachyos | manyspike flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Cyperus polystachyos var. texensis | Texan flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Cyperus pseudovegetus | marsh flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Cyperus retrofractus | rough flatsedge | Sedge family | Graminoid | LA(Orleans) | ||
| Cyperus retrorsus | pine barren flatsedge | Sedge family | Graminoid | LA(Jefferson, St. Charles, Terrebonne) | ||
| Cyperus retrorsus var. retrorsus | pine barren flatsedge | Sedge family | Graminoid | LA(Jefferson, St. Charles, Terrebonne) | ||
| Cyperus squarrosus | bearded flatsedge | Sedge family | Graminoid | LA(Orleans, St. Charles) | ||
| Cyperus strigosus | strawcolored flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyperus surinamensis | tropical flatsedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Cyperus thyrsiflorus | southern flatsedge | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Cyperus virens | green flatsedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Cyrtomium | netvein hollyfern | Wood Fern family | LA(Orleans, St. Charles) | |||
| Datura | jimsonweed | Potato family | LA(St. Charles, Terrebonne) | |||
| Daucus | wild carrot | Carrot family | LA(Orleans, St. Charles, Terrebonne) | |||
| Daucus pusillus | American wild carrot | Carrot family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Decodon | decodon | Loosestrife family | LA(Lafourche, St. Charles, Terrebonne) | |||
| Decodon verticillatus | swamp loosestrife | Loosestrife family | Subshrub, Shrub | LA(Lafourche, St. Charles, Terrebonne) | ||
| Decumaria | decumaria | Hydrangea family | LA(Terrebonne) | |||
| Decumaria barbara | woodvamp | Hydrangea family | Vine | LA(Terrebonne) | ||
| Desmanthus | bundleflower | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Desmanthus illinoensis | Illinois bundleflower | Pea family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Desmodium | ticktrefoil | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Desmodium canescens | hoary ticktrefoil | Pea family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Desmodium fernaldii | Fernald's ticktrefoil | Pea family | Forb/herb | LA(Jefferson) | ||
| Desmodium glabellum | Dillenius' ticktrefoil | Pea family | Forb/herb | LA(Jefferson, St. Bernard, St. Charles) | ||
| Desmodium laevigatum | smooth ticktrefoil | Pea family | Forb/herb | LA(Jefferson, St. Bernard) | ||
| Desmodium obtusum | stiff ticktrefoil | Pea family | Forb/herb | LA(Jefferson) | ||
| Desmodium paniculatum | panicledleaf ticktrefoil | Pea family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Desmodium paniculatum var. paniculatum | panicledleaf ticktrefoil | Pea family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Desmodium sessilifolium | sessileleaf ticktrefoil | Pea family | Forb/herb | LA(Orleans) | ||
| Desmodium tortuosum | dixie ticktrefoil | Pea family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Dichanthelium | rosette grass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Dichanthelium aciculare | needleleaf rosette grass | Grass family | Graminoid | LA(Terrebonne) | ||
| Dichanthelium acuminatum | tapered rosette grass | Grass family | Graminoid | LA(Jefferson, Lafourche) | ||
| Dichanthelium acuminatum var. acuminatum | tapered rosette grass | Grass family | Graminoid | LA(Jefferson, Lafourche) | ||
| Dichanthelium commutatum | variable panicgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Dichanthelium dichotomum | cypress panicgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Dichanthelium dichotomum var. dichotomum | cypress panicgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Dichanthelium laxiflorum | openflower rosette grass | Grass family | Graminoid | LA(Jefferson, Lafourche) | ||
| Dichanthelium scoparium | velvet panicum | Grass family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Dichanthelium sphaerocarpon | roundseed panicgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Terrebonne) | ||
| Dichanthelium sphaerocarpon var. sphaerocarpon | roundseed panicgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Terrebonne) | ||
| Dichondra | ponysfoot | Morning-glory family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Dichondra carolinensis | Carolina ponysfoot | Morning-glory family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Dicliptera | foldwing | Acanthus family | LA(Jefferson, St. Charles) | |||
| Dicliptera brachiata | branched foldwing | Acanthus family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Digitaria | crabgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Digitaria bicornis | Asian crabgrass | Grass family | Graminoid | LA(Orleans) | ||
| Digitaria ciliaris | southern crabgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Diodia | buttonweed | Madder family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Diodia teres | poorjoe | Madder family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Diodia teres var. teres | poorjoe | Madder family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Diodia virginiana | Virginia buttonweed | Madder family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Diodia virginiana var. virginiana | Virginia buttonweed | Madder family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Dioscorea | yam | Yam family | LA(Orleans, St. Charles) | |||
| Dioscorea villosa | wild yam | Yam family | Forb/herb, Vine | LA(St. Charles) | ||
| Diospyros | diospyros | Ebony family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Diospyros virginiana | common persimmon | Ebony family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Distichlis | saltgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Distichlis spicata | saltgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Dracopis | coneflower | Aster family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Dracopis amplexicaulis | clasping coneflower | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Drymaria | drymary | Pink family | LA(Lafourche) | |||
| Drymaria cordata | whitesnow | Pink family | Forb/herb | LA(Lafourche) | ||
| Drymaria cordata ssp. cordata | whitesnow | Pink family | Forb/herb | LA(Lafourche) | ||
| Dysphania | dysphania | Goosefoot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Echinochloa | cockspur grass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Echinochloa muricata | rough barnyardgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Echinochloa walteri | coast cockspur grass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Echinodorus | burhead | Water-plantain family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Echinodorus berteroi | upright burhead | Water-plantain family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Echinodorus cordifolius | creeping burhead | Water-plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eclipta | eclipta | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Eclipta prostrata | false daisy | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Elaeagnus | oleaster | Oleaster family | LA(Orleans) | |||
| Eleocharis | spikerush | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Eleocharis albida | white spikerush | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eleocharis baldwinii | Baldwin's spikerush | Sedge family | Graminoid | LA(Jefferson, Lafourche, Terrebonne) | ||
| Eleocharis brittonii | Britton's spikerush | Sedge family | Graminoid | LA(Jefferson) | ||
| Eleocharis cellulosa | Gulf Coast spikerush | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Eleocharis compressa | flatstem spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis compressa var. compressa | flatstem spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis fallax | creeping spikerush | Sedge family | Graminoid | LA(Orleans, St. Bernard, St. Charles) | ||
| Eleocharis flavescens | yellow spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis flavescens var. flavescens | yellow spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis geniculata | Canada spikesedge | Sedge family | Graminoid | LA(Jefferson, Terrebonne) | ||
| Eleocharis microcarpa | smallfruit spikerush | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans) | ||
| Eleocharis montana | mountain spikerush | Sedge family | Graminoid | LA(St. Bernard, Terrebonne) | ||
| Eleocharis montevidensis | sand spikerush | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eleocharis obtusa | blunt spikerush | Sedge family | Graminoid | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Eleocharis palustris | common spikerush | Sedge family | Graminoid | LA(Jefferson, St. Charles) | ||
| Eleocharis palustris var. palustris | common spikerush | Sedge family | Graminoid | LA(Jefferson, St. Charles) | ||
| Eleocharis parvula | dwarf spikerush | Sedge family | Graminoid | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eleocharis quadrangulata | squarestem spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis rostellata | beaked spikerush | Sedge family | Graminoid | LA(Jefferson) | ||
| Eleocharis tenuis | slender spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis tenuis var. tenuis | slender spikerush | Sedge family | Graminoid | LA(Orleans) | ||
| Eleocharis vivipara | viviparous spikerush | Sedge family | Graminoid | LA(St. Charles) | ||
| Elephantopus | elephantsfoot | Aster family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Elephantopus carolinianus | Carolina elephantsfoot | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Elephantopus tomentosus | devil's grandmother | Aster family | Forb/herb | LA(Orleans, St. Charles) | ||
| Elymus | wildrye | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Elymus macgregorii | early wildrye | Grass family | Graminoid | LA(Jefferson) | ||
| Elymus virginicus | Virginia wildrye | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Elymus virginicus var. virginicus | Virginia wildrye | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Emilia | tasselflower | Aster family | LA(Jefferson, St. Charles) | |||
| Epidendrum | star orchid | Orchid family | LA(Jefferson, Lafourche, St. Bernard) | |||
| Epidendrum magnoliae | green fly orchid | Orchid family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard) | ||
| Epidendrum magnoliae var. magnoliae | green fly orchid | Orchid family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard) | ||
| Equisetum | horsetail | Horsetail family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Equisetum ×ferrissii | Horsetail family | Forb/herb | LA(Jefferson, St. Charles) | |||
| Equisetum hyemale | scouringrush horsetail | Horsetail family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Equisetum hyemale var. affine | scouringrush horsetail | Horsetail family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eragrostis | lovegrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Eragrostis curtipedicellata | gummy lovegrass | Grass family | Graminoid | LA(Terrebonne) | ||
| Eragrostis elliottii | field lovegrass | Grass family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Eragrostis hypnoides | teal lovegrass | Grass family | Graminoid | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Eragrostis lugens | mourning lovegrass | Grass family | Graminoid | LA(Terrebonne) | ||
| Eragrostis pectinacea | tufted lovegrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eragrostis refracta | coastal lovegrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Eragrostis secundiflora | red lovegrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Eragrostis secundiflora ssp. oxylepis | red lovegrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Eragrostis spectabilis | purple lovegrass | Grass family | Graminoid | LA(St. Charles, Terrebonne) | ||
| Erechtites | burnweed | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Erechtites hieraciifolius | American burnweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Erechtites hieraciifolius var. hieraciifolius | American burnweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Erigeron | fleabane | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Erigeron philadelphicus | Philadelphia fleabane | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Erigeron philadelphicus var. philadelphicus | Philadelphia fleabane | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Erigeron procumbens | Corpus Christi fleabane | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Erigeron quercifolius | oakleaf fleabane | Aster family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Erigeron strigosus | prairie fleabane | Aster family | Forb/herb | LA(Jefferson, Orleans) | ||
| Eriochloa | cupgrass | Grass family | LA(Lafourche) | |||
| Eriochloa acuminata var. acuminata | tapertip cupgrass | Grass family | Graminoid | LA(Lafourche) | ||
| Eryngium | eryngo | Carrot family | LA(Jefferson, Orleans, Terrebonne) | |||
| Eryngium prostratum | creeping eryngo | Carrot family | Forb/herb | LA(Jefferson, Terrebonne) | ||
| Eryngium yuccifolium | button eryngo | Carrot family | Forb/herb | LA(Orleans) | ||
| Erythrina | erythrina | Pea family | LA(Lafourche, St. Charles) | |||
| Eubotrys | doghobble | Heath family | LA(St. Charles) | |||
| Eubotrys racemosus | swamp doghobble | Heath family | Shrub | LA(St. Charles) | ||
| Euonymus | spindletree | Bittersweet family | LA(Orleans, St. Charles) | |||
| Eupatorium | thoroughwort | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Eupatorium ×pinnatifidum | thoroughwort | Aster family | Forb/herb | LA(St. Bernard, Terrebonne) | ||
| Eupatorium album | white thoroughwort | Aster family | Forb/herb | LA(Orleans) | ||
| Eupatorium album var. album | white thoroughwort | Aster family | Forb/herb | LA(Orleans) | ||
| Eupatorium altissimum | tall thoroughwort | Aster family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Eupatorium capillifolium | dogfennel | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Eupatorium compositifolium | yankeeweed | Aster family | Forb/herb | LA(Terrebonne) | ||
| Eupatorium perfoliatum | common boneset | Aster family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Eupatorium perfoliatum var. perfoliatum | common boneset | Aster family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Eupatorium serotinum | lateflowering thoroughwort | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Euphorbia | spurge | Spurge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Euphorbia corollata | flowering spurge | Spurge family | Forb/herb | LA(Jefferson) | ||
| Euphorbia cyathophora | fire on the mountain | Spurge family | Forb/herb | LA(Jefferson, Orleans) | ||
| Euphorbia dentata | toothed spurge | Spurge family | Forb/herb | LA(Orleans, St. Charles) | ||
| Euphorbia dentata var. dentata | toothed spurge | Spurge family | Forb/herb | LA(Orleans, St. Charles) | ||
| Euphorbia heterophylla | Mexican fireplant | Spurge family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Euphorbia marginata | snow on the mountain | Spurge family | Forb/herb | LA(Jefferson, Orleans) | ||
| Euphorbia polyphylla | Lesser Florida spurge | Spurge family | Forb/herb | LA(St. Bernard) | ||
| Euphorbia spathulata | warty spurge | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Eustachys | fingergrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Eustachys petraea | pinewoods fingergrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Eustoma | prairie gentian | Gentian family | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | |||
| Eustoma exaltatum | catchfly prairie gentian | Gentian family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | ||
| Euthamia | goldentop | Aster family | LA(Jefferson, Orleans) | |||
| Euthamia leptocephala | bushy goldentop | Aster family | Forb/herb | LA(Jefferson, Orleans) | ||
| Festuca | fescue | Grass family | LA(Orleans, St. Charles) | |||
| Festuca subverticillata | nodding fescue | Grass family | Graminoid | LA(Orleans, St. Charles) | ||
| Ficus | fig | Mulberry family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Fimbristylis | fimbry | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Fimbristylis annua | annual fimbry | Sedge family | Graminoid | LA(Lafourche, St. Charles, Terrebonne) | ||
| Fimbristylis autumnalis | slender fimbry | Sedge family | Graminoid | LA(Orleans) | ||
| Fimbristylis caroliniana | Carolina fimbry | Sedge family | Graminoid | LA(St. Bernard) | ||
| Fimbristylis castanea | marsh fimbry | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Fimbristylis dichotoma | forked fimbry | Sedge family | Graminoid | LA(Jefferson, Orleans) | ||
| Fimbristylis tomentosa | woolly fimbry | Sedge family | Graminoid | LA(Orleans) | ||
| Fimbristylis vahlii | Vahl's fimbry | Sedge family | Graminoid | LA(Orleans, St. Bernard, St. Charles) | ||
| Fleischmannia | thoroughwort | Aster family | LA(Lafourche, Orleans, Terrebonne) | |||
| Fleischmannia incarnata | pink thoroughwort | Aster family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Forestiera | swampprivet | Olive family | LA(Lafourche, Orleans, St. Charles) | |||
| Forestiera acuminata | eastern swampprivet | Olive family | Shrub, Tree | LA(Lafourche, Orleans, St. Charles) | ||
| Frangula | buckthorn | Buckthorn family | LA(Orleans) | |||
| Frangula caroliniana | Carolina buckthorn | Buckthorn family | Shrub, Tree | LA(Orleans) | ||
| Fraxinus | ash | Olive family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Fraxinus americana | white ash | Olive family | Tree | LA(Lafourche, Orleans, St. Charles) | ||
| Fraxinus berlandieriana | Mexican ash | Olive family | Tree | LA(Orleans, St. Charles) | ||
| Fraxinus caroliniana | Carolina ash | Olive family | Tree, Shrub | LA(Orleans, St. Charles) | ||
| Fraxinus pennsylvanica | green ash | Olive family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Fraxinus profunda | pumpkin ash | Olive family | Tree | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Fuirena | umbrella-sedge | Sedge family | LA(Orleans, St. Charles) | |||
| Fuirena scirpoidea | southern umbrella-sedge | Sedge family | Graminoid | LA(Orleans) | ||
| Fuirena simplex | western umbrella-sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Fuirena simplex var. simplex | western umbrella-sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Fuirena squarrosa | hairy umbrella-sedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Gaillardia | blanketflower | Aster family | LA(Jefferson, Orleans, Terrebonne) | |||
| Gaillardia pulchella | Indian blanket | Aster family | Forb/herb, Subshrub | LA(Jefferson, Orleans, Terrebonne) | ||
| Galactia | milkpea | Pea family | LA(Jefferson, Orleans, St. Bernard) | |||
| Galactia volubilis | downy milkpea | Pea family | Vine, Forb/herb | LA(Jefferson, Orleans, St. Bernard) | ||
| Galium | bedstraw | Madder family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Galium aparine | stickywilly | Madder family | Forb/herb, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Galium obtusum | bluntleaf bedstraw | Madder family | Forb/herb | LA(Jefferson) | ||
| Galium obtusum ssp. obtusum | bluntleaf bedstraw | Madder family | Forb/herb | LA(Jefferson) | ||
| Galium tinctorium | stiff marsh bedstraw | Madder family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Galium trifidum | threepetal bedstraw | Madder family | Vine, Forb/herb | LA(Orleans) | ||
| Galium trifidum ssp. subbiflorum | threepetal bedstraw | Madder family | Vine, Forb/herb | LA(Orleans) | ||
| Galium virgatum | southwestern bedstraw | Madder family | Forb/herb | LA(Orleans) | ||
| Gamochaeta | everlasting | Aster family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Gamochaeta falcata | narrowleaf purple everlasting | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Gamochaeta pensylvanica | Pennsylvania everlasting | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Bernard) | ||
| Gamochaeta purpurea | spoonleaf purple everlasting | Aster family | Forb/herb | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Gelsemium | trumpetflower | Logania family | LA(Orleans) | |||
| Gelsemium sempervirens | evening trumpetflower | Logania family | Vine, Shrub | LA(Orleans) | ||
| Geranium | geranium | Geranium family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Geranium carolinianum | Carolina geranium | Geranium family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Geranium carolinianum var. carolinianum | Carolina geranium | Geranium family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Geranium texanum | Texas geranium | Geranium family | Forb/herb | LA(Orleans) | ||
| Geum | avens | Rose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Geum canadense | white avens | Rose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Geum canadense var. texanum | Texan avens | Rose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Glandularia | mock vervain | Verbena family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Gleditsia | locust | Pea family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Gleditsia aquatica | water locust | Pea family | Tree, Shrub | LA(Jefferson, St. Charles, Terrebonne) | ||
| Gleditsia triacanthos | honeylocust | Pea family | Shrub, Tree | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Glyceria | mannagrass | Grass family | LA(Jefferson, Orleans, Terrebonne) | |||
| Glyceria arkansana | Arkansas mannagrass | Grass family | Graminoid | LA(Jefferson, Orleans, Terrebonne) | ||
| Gomphrena | globe amaranth | Amaranth family | LA(St. Charles) | |||
| Gratiola | hedgehyssop | Figwort family | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Gratiola virginiana | roundfruit hedgehyssop | Figwort family | Forb/herb | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Gratiola virginiana var. virginiana | roundfruit hedgehyssop | Figwort family | Forb/herb | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Habenaria | bog orchid | Orchid family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Habenaria repens | waterspider bog orchid | Orchid family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Habranthus | copperlily | Lily family | LA(St. Charles) | |||
| Habranthus tubispathus | Rio Grande copperlily | Lily family | Forb/herb | LA(St. Charles) | ||
| Halodule | halodule | Manatee-grass family | LA(St. Bernard, Terrebonne) | |||
| Halodule wrightii | shoalweed | Manatee-grass family | Forb/herb | LA(St. Bernard, Terrebonne) | ||
| Halophila | seagrass | Tape-grass family | LA(St. Bernard) | |||
| Halophila engelmannii | Engelmann's seagrass | Tape-grass family | Forb/herb | LA(St. Bernard) | ||
| Helenium | sneezeweed | Aster family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Helenium amarum | sneezeweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Helenium amarum var. amarum | sneezeweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Helenium autumnale | common sneezeweed | Aster family | Forb/herb | LA(St. Charles) | ||
| Helenium autumnale var. autumnale | common sneezeweed | Aster family | Forb/herb | LA(St. Charles) | ||
| Helenium flexuosum | purplehead sneezeweed | Aster family | Forb/herb | LA(Lafourche) | ||
| Helenium quadridentatum | longdisk sneezeweed | Aster family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Helianthus | sunflower | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Helianthus angustifolius | swamp sunflower | Aster family | Forb/herb | LA(Orleans) | ||
| Helianthus annuus | common sunflower | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Helianthus debilis | cucumberleaf sunflower | Aster family | Forb/herb | LA(St. Charles) | ||
| Helianthus debilis ssp. cucumerifolius | cucumberleaf sunflower | Aster family | Forb/herb | LA(St. Charles) | ||
| Helianthus floridanus | Florida sunflower | Aster family | Forb/herb | LA(Orleans) | ||
| Helianthus grosseserratus | sawtooth sunflower | Aster family | Forb/herb | LA(St. Bernard) | ||
| Helianthus simulans | muck sunflower | Aster family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Heliotropium | heliotrope | Borage family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Heliotropium curassavicum | salt heliotrope | Borage family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Heliotropium curassavicum var. curassavicum | salt heliotrope | Borage family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Heliotropium procumbens | fourspike heliotrope | Borage family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Heliotropium procumbens var. procumbens | fourspike heliotrope | Borage family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Heliotropium tenellum | pasture heliotrope | Borage family | Forb/herb | LA(Orleans) | ||
| Herbertia | herbertia | Iris family | LA(St. Bernard) | |||
| Herbertia lahue | prairienymph | Iris family | Forb/herb | LA(St. Bernard) | ||
| Herbertia lahue ssp. caerulea | prairienymph | Iris family | Forb/herb | LA(St. Bernard) | ||
| Heteranthera | mudplantain | Water-Hyacinth family | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | |||
| Heteranthera dubia | grassleaf mudplantain | Water-Hyacinth family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Heteranthera limosa | blue mudplantain | Water-Hyacinth family | Forb/herb | LA(Terrebonne) | ||
| Heteranthera reniformis | kidneyleaf mudplantain | Water-Hyacinth family | Forb/herb | LA(St. Charles) | ||
| Heterotheca | false goldenaster | Aster family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Heterotheca subaxillaris | camphorweed | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Hibiscus | rosemallow | Mallow family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Hibiscus coccineus | scarlet rosemallow | Mallow family | Forb/herb | LA(Jefferson) | ||
| Hibiscus grandiflorus | swamp rosemallow | Mallow family | Shrub, Subshrub | LA(Orleans) | ||
| Hibiscus laevis | halberdleaf rosemallow | Mallow family | Forb/herb | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hibiscus moscheutos | crimsoneyed rosemallow | Mallow family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hordeum | barley | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Hordeum pusillum | little barley | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hottonia | hottonia | Primrose family | LA(Terrebonne) | |||
| Hottonia inflata | American featherfoil | Primrose family | Forb/herb | LA(Terrebonne) | ||
| Houstonia | bluet | Madder family | LA(Jefferson) | |||
| Houstonia purpurea | Venus' pride | Madder family | Forb/herb | LA(Jefferson) | ||
| Houstonia purpurea var. purpurea | Venus' pride | Madder family | Forb/herb | LA(Jefferson) | ||
| Hydrocotyle | hydrocotyle | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Hydrocotyle bonariensis | largeleaf pennywort | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Hydrocotyle ranunculoides | floating marshpennywort | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Hydrocotyle umbellata | manyflower marshpennywort | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Hydrocotyle verticillata | whorled marshpennywort | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hydrocotyle verticillata var. verticillata | whorled marshpennywort | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hydrolea | false fiddleleaf | Waterleaf family | LA(Lafourche, Terrebonne) | |||
| Hydrolea uniflora | oneflower false fiddleleaf | Waterleaf family | Forb/herb | LA(Lafourche, Terrebonne) | ||
| Hygrophila | swampweed | Acanthus family | LA(Jefferson, Lafourche, Orleans, Terrebonne) | |||
| Hygrophila lacustris | gulf swampweed | Acanthus family | Forb/herb | LA(Jefferson, Lafourche, Orleans, Terrebonne) | ||
| Hymenocallis | spiderlily | Lily family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Hymenocallis liriosme | spring spiderlily | Lily family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hypericum | St. Johnswort | Mangosteen family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Hypericum crux-andreae | St. Peterswort | Mangosteen family | Subshrub, Shrub | LA(Orleans) | ||
| Hypericum hypericoides | St. Andrew's cross | Mangosteen family | Subshrub, Shrub | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hypericum hypericoides ssp. hypericoides | St. Andrew's cross | Mangosteen family | Shrub, Subshrub | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Hypericum mutilum | dwarf St. Johnswort | Mangosteen family | Forb/herb | LA(Jefferson, St. Charles, Terrebonne) | ||
| Hypericum punctatum | spotted St. Johnswort | Mangosteen family | Forb/herb | LA(Jefferson) | ||
| Hypericum setosum | hairy St. Johnswort | Mangosteen family | Forb/herb | LA(Orleans) | ||
| Hypoxis | star-grass | Lily family | LA(Jefferson) | |||
| Hypoxis sessilis | glossyseed yellow star-grass | Lily family | Forb/herb | LA(Jefferson) | ||
| Hypoxis wrightii | Wright's star-grass | Lily family | Forb/herb | LA(Jefferson) | ||
| Hyptis | bushmint | Mint family | LA(Lafourche, Terrebonne) | |||
| Hyptis alata | clustered bushmint | Mint family | Forb/herb | LA(Lafourche, Terrebonne) | ||
| Ilex | holly | Holly family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ilex cassine | dahoon | Holly family | Tree, Shrub | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ilex cassine var. cassine | dahoon | Holly family | Tree, Shrub | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ilex decidua | possumhaw | Holly family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ilex longipes | Georgia holly | Holly family | Tree, Shrub | LA(Terrebonne) | ||
| Ilex opaca | American holly | Holly family | Tree, Shrub | LA(St. Charles) | ||
| Ilex opaca var. opaca | American holly | Holly family | Tree, Shrub | LA(St. Charles) | ||
| Ilex verticillata | common winterberry | Holly family | Tree, Shrub | LA(St. Charles) | ||
| Ilex vomitoria | yaupon | Holly family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Impatiens | touch-me-not | Touch-me-not family | LA(Orleans, St. Charles) | |||
| Imperata | satintail | Grass family | LA(Orleans) | |||
| Indigofera | indigo | Pea family | LA(Jefferson, Terrebonne) | |||
| Indigofera miniata | coastal indigo | Pea family | Forb/herb | LA(Terrebonne) | ||
| Indigofera suffruticosa | anil de pasto | Pea family | Subshrub, Forb/herb | LA(Jefferson) | ||
| Ipomoea | morning-glory | Morning-glory family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ipomoea ×leucantha | whitestar morning-glory | Morning-glory family | Forb/herb | LA(Jefferson, Orleans) | ||
| Ipomoea alba | tropical white morning-glory | Morning-glory family | Vine, Forb/herb | LA(Orleans) | ||
| Ipomoea cordatotriloba | tievine | Morning-glory family | Forb/herb, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ipomoea cordatotriloba var. cordatotriloba | tievine | Morning-glory family | Forb/herb, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ipomoea hederifolia | scarletcreeper | Morning-glory family | Vine, Forb/herb | LA(Orleans) | ||
| Ipomoea imperati | beach morning-glory | Morning-glory family | Vine, Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Ipomoea lacunosa | whitestar | Morning-glory family | Forb/herb, Vine | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ipomoea pandurata | man of the earth | Morning-glory family | Forb/herb, Vine | LA(Orleans, St. Charles) | ||
| Ipomoea pes-caprae | bayhops | Morning-glory family | Vine, Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Ipomoea pes-caprae ssp. brasiliensis | Brazilian bayhops | Morning-glory family | Forb/herb, Vine | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Ipomoea sagittata | saltmarsh morning-glory | Morning-glory family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Iresine | bloodleaf | Amaranth family | LA(Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Iresine diffusa | Juba's bush | Amaranth family | Subshrub, Forb/herb | LA(Orleans) | ||
| Iresine rhizomatosa | Juda's bush | Amaranth family | Forb/herb | LA(Lafourche, St. Charles, Terrebonne) | ||
| Iris | iris | Iris family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Iris brevicaulis | zigzag iris | Iris family | Forb/herb | LA(Orleans) | ||
| Iris fulva | copper iris | Iris family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Iris giganticaerulea | giant blue iris | Iris family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Iris hexagona | Dixie iris | Iris family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Iris virginica | Virginia iris | Iris family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Isolepis | bulrush | Sedge family | LA(Jefferson, Orleans) | |||
| Isolepis carinata | keeled bulrush | Sedge family | Graminoid | LA(Jefferson, Orleans) | ||
| Isotria | fiveleaf orchid | Orchid family | LA(Orleans) | |||
| Isotria verticillata | large whorled pogonia | Orchid family | Forb/herb | LA(Orleans) | ||
| Itea | sweetspire | Currant family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Itea virginica | Virginia sweetspire | Currant family | Shrub | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Iva | marsh elder | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Iva annua | annual marsh elder | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Iva frutescens | Jesuit's bark | Aster family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Iva frutescens ssp. frutescens | Jesuit's bark | Aster family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Iva imbricata | seacoast marsh elder | Aster family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Jacquemontia | clustervine | Morning-glory family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Jacquemontia tamnifolia | hairy clustervine | Morning-glory family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Juncus | rush | Rush family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Juncus acuminatus | tapertip rush | Rush family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Juncus brachycarpus | whiteroot rush | Rush family | Graminoid | LA(Lafourche) | ||
| Juncus bufonius | toad rush | Rush family | Graminoid | LA(Jefferson, St. Charles, Terrebonne) | ||
| Juncus bufonius var. bufonius | toad rush | Rush family | Graminoid | LA(Jefferson, St. Charles, Terrebonne) | ||
| Juncus coriaceus | leathery rush | Rush family | Graminoid | LA(Lafourche, St. Charles) | ||
| Juncus debilis | weak rush | Rush family | Graminoid | LA(St. Charles) | ||
| Juncus dichotomus | forked rush | Rush family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Juncus diffusissimus | slimpod rush | Rush family | Graminoid | LA(Jefferson, St. Charles) | ||
| Juncus effusus | common rush | Rush family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Juncus effusus var. solutus | lamp rush | Rush family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Juncus elliottii | Elliott's rush | Rush family | Graminoid | LA(Orleans) | ||
| Juncus elliottii var. elliottii | Elliott's rush | Rush family | Graminoid | LA(Orleans) | ||
| Juncus longii | Long's rush | Rush family | Graminoid | LA(St. Charles) | ||
| Juncus marginatus | grassleaf rush | Rush family | Graminoid | LA(Jefferson, Lafourche, St. Charles) | ||
| Juncus megacephalus | bighead rush | Rush family | Graminoid | LA(Jefferson, St. Bernard, St. Charles) | ||
| Juncus nodatus | stout rush | Rush family | Graminoid | LA(Lafourche, Orleans, St. Charles) | ||
| Juncus paludosus | swamp rush | Rush family | Graminoid | LA(Lafourche, Terrebonne) | ||
| Juncus polycephalos | manyhead rush | Rush family | Graminoid | LA(Orleans, St. Charles, Terrebonne) | ||
| Juncus roemerianus | needlegrass rush | Rush family | Graminoid | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Juncus scirpoides | needlepod rush | Rush family | Graminoid | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Juncus tenuis | poverty rush | Rush family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Juncus torreyi | Torrey's rush | Rush family | Graminoid | LA(Orleans, St. Charles) | ||
| Juncus validus | roundhead rush | Rush family | Graminoid | LA(Orleans, St. Bernard, St. Charles) | ||
| Juncus validus var. validus | roundhead rush | Rush family | Graminoid | LA(Orleans, St. Bernard, St. Charles) | ||
| Juniperus | juniper | Cypress family | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Juniperus virginiana | eastern redcedar | Cypress family | Tree | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Juniperus virginiana var. silicicola | southern redcedar | Cypress family | Tree | LA(Orleans, St. Bernard) | ||
| Juniperus virginiana var. virginiana | eastern redcedar | Cypress family | Tree | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Justicia | water-willow | Acanthus family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Justicia americana | American water-willow | Acanthus family | Forb/herb | LA(Lafourche) | ||
| Justicia lanceolata | looseflower water-willow | Acanthus family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Kosteletzkya | kosteletzkya | Mallow family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Kosteletzkya virginica | Virginia saltmarsh mallow | Mallow family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Krigia | dwarfdandelion | Aster family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Krigia caespitosa | weedy dwarfdandelion | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Krigia dandelion | potato dwarfdandelion | Aster family | Forb/herb | LA(St. Bernard) | ||
| Kyllinga | spikesedge | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Kyllinga brevifolia | shortleaf spikesedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Kyllinga odorata | fragrant spikesedge | Sedge family | Graminoid | LA(Orleans) | ||
| Lactuca | lettuce | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Lactuca canadensis | Canada lettuce | Aster family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Lactuca floridana | woodland lettuce | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Lactuca hirsuta | hairy lettuce | Aster family | Forb/herb | LA(Orleans) | ||
| Lactuca ludoviciana | biannual lettuce | Aster family | Forb/herb | LA(Jefferson) | ||
| Landoltia | duckmeat | Duckweed family | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | |||
| Landoltia punctata | dotted duckmeat | Duckweed family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Lantana | lantana | Verbena family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Lantana urticoides | West Indian shrubverbena | Verbena family | Shrub | LA(Jefferson) | ||
| Lathyrus | pea | Pea family | LA(Orleans) | |||
| Lathyrus pusillus | tiny pea | Pea family | Vine, Forb/herb | LA(Orleans) | ||
| Lechea | pinweed | Rock-rose family | LA(St. Bernard) | |||
| Lechea minor | thymeleaf pinweed | Rock-rose family | Forb/herb | LA(St. Bernard) | ||
| Leersia | cutgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Leersia hexandra | southern cutgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | ||
| Leersia lenticularis | catchfly grass | Grass family | Graminoid | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Leersia oryzoides | rice cutgrass | Grass family | Graminoid | LA(Lafourche, St. Charles, Terrebonne) | ||
| Leersia virginica | whitegrass | Grass family | Graminoid | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Lemna | duckweed | Duckweed family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Lemna aequinoctialis | lesser duckweed | Duckweed family | Forb/herb | LA(Jefferson, Orleans) | ||
| Lemna obscura | little duckweed | Duckweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Lemna valdiviana | valdivia duckweed | Duckweed family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Lepidium | pepperweed | Mustard family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Lepidium virginicum | Virginia pepperweed | Mustard family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Leptochloa | sprangletop | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Leptochloa fusca | Malabar sprangletop | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Leptochloa fusca ssp. fascicularis | bearded sprangletop | Grass family | Graminoid | LA(Jefferson, Orleans, St. Charles) | ||
| Leptochloa fusca ssp. uninervia | Mexican sprangletop | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Leptochloa nealleyi | Nealley's sprangletop | Grass family | Graminoid | LA(Orleans, St. Bernard, St. Charles) | ||
| Leptochloa panicea | mucronate sprangletop | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Leptochloa panicea ssp. mucronata | mucronate sprangletop | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Leptochloa panicoides | Amazon sprangletop | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Leptochloa scabra | rough sprangletop | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Lespedeza | lespedeza | Pea family | LA(Orleans) | |||
| Leucospora | leucospora | Figwort family | LA(Orleans, St. Charles) | |||
| Leucospora multifida | narrowleaf paleseed | Figwort family | Forb/herb | LA(Orleans, St. Charles) | ||
| Lilaeopsis | grasswort | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Lilaeopsis carolinensis | Carolina grasswort | Carrot family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Lilaeopsis chinensis | eastern grasswort | Carrot family | Forb/herb | LA(Lafourche, St. Bernard, St. Charles) | ||
| Limnobium | spongeplant | Tape-grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Limnobium spongia | American spongeplant | Tape-grass family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Limnodea | Ozark grass | Grass family | LA(Jefferson, Orleans) | |||
| Limnodea arkansana | Ozark grass | Grass family | Graminoid | LA(Jefferson, Orleans) | ||
| Limnophila | marshweed | Figwort family | LA(Lafourche) | |||
| Limnophila ×ludoviciana | marshweed | Figwort family | Forb/herb | LA(Lafourche) | ||
| Limnosciadium | dogshade | Carrot family | LA(Jefferson, Lafourche) | |||
| Limnosciadium pinnatum | tansy dogshade | Carrot family | Forb/herb | LA(Jefferson, Lafourche) | ||
| Limonium | sea lavender | Leadwort family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Limonium carolinianum | lavender thrift | Leadwort family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Lindera | spicebush | Laurel family | LA(Orleans) | |||
| Lindera benzoin | northern spicebush | Laurel family | Tree, Shrub | LA(Orleans) | ||
| Lindera benzoin var. pubescens | northern spicebush | Laurel family | Tree, Shrub | LA(Orleans) | ||
| Lindernia | false pimpernel | Figwort family | LA(Orleans, St. Charles) | |||
| Lindernia dubia | yellowseed false pimpernel | Figwort family | Forb/herb | LA(Orleans, St. Charles) | ||
| Lindernia dubia var. anagallidea | yellowseed false pimpernel | Figwort family | Forb/herb | LA(Orleans, St. Charles) | ||
| Lindernia dubia var. dubia | yellowseed false pimpernel | Figwort family | Forb/herb | LA(Orleans, St. Charles) | ||
| Linum | flax | Flax family | LA(Jefferson, St. Charles, Terrebonne) | |||
| Linum medium | stiff yellow flax | Flax family | Forb/herb | LA(Jefferson) | ||
| Linum medium var. texanum | stiff yellow flax | Flax family | Forb/herb | LA(Jefferson) | ||
| Lipocarpha | halfchaff sedge | Sedge family | LA(Orleans, St. Charles) | |||
| Lipocarpha micrantha | smallflower halfchaff sedge | Sedge family | Graminoid | LA(Orleans, St. Charles) | ||
| Liquidambar | sweetgum | Witch-hazel family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Liquidambar styraciflua | sweetgum | Witch-hazel family | Tree | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Liriodendron | tuliptree | Magnolia family | LA(Orleans) | |||
| Liriodendron tulipifera | tuliptree | Magnolia family | Tree | LA(Orleans) | ||
| Lithospermum | stoneseed | Borage family | LA(Jefferson, Terrebonne) | |||
| Lithospermum tuberosum | tuberous stoneseed | Borage family | Forb/herb | LA(Jefferson, Terrebonne) | ||
| Lobelia | lobelia | Bellflower family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Lobelia amoena | southern lobelia | Bellflower family | Forb/herb | LA(Jefferson) | ||
| Lobelia amoena var. glandulifera | southern lobelia | Bellflower family | Forb/herb | LA(Jefferson) | ||
| Lobelia cardinalis | cardinalflower | Bellflower family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Lobelia elongata | longleaf lobelia | Bellflower family | Forb/herb | LA(St. Charles) | ||
| Lobelia nuttallii | Nuttall's lobelia | Bellflower family | Forb/herb | LA(Orleans) | ||
| Lobelia puberula | downy lobelia | Bellflower family | Forb/herb | LA(St. Charles) | ||
| Lobelia puberula var. puberula | downy lobelia | Bellflower family | Forb/herb | LA(St. Charles) | ||
| Lobelia siphilitica | great blue lobelia | Bellflower family | Forb/herb | LA(St. Charles) | ||
| Lobelia siphilitica var. ludoviciana | great blue lobelia | Bellflower family | Forb/herb | LA(St. Charles) | ||
| Lonicera | honeysuckle | Honeysuckle family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Lonicera sempervirens | trumpet honeysuckle | Honeysuckle family | Vine | LA(St. Charles) | ||
| Ludwigia | primrose-willow | Evening Primrose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ludwigia decurrens | wingleaf primrose-willow | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Ludwigia glandulosa | cylindricfruit primrose-willow | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Ludwigia leptocarpa | anglestem primrose-willow | Evening Primrose family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ludwigia octovalvis | Mexican primrose-willow | Evening Primrose family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ludwigia octovalvis ssp. octovalvis | Mexican primrose-willow | Evening Primrose family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ludwigia palustris | marsh seedbox | Evening Primrose family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ludwigia peploides | floating primrose-willow | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ludwigia peploides ssp. glabrescens | floating primrose-willow | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Ludwigia peploides ssp. peploides | floating primrose-willow | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, St. Charles) | ||
| Ludwigia repens | creeping primrose-willow | Evening Primrose family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Lupinus | lupine | Pea family | LA(Jefferson, Lafourche) | |||
| Lupinus subcarnosus | Texas bluebonnet | Pea family | Forb/herb | LA(Lafourche) | ||
| Lupinus texensis | Texas lupine | Pea family | Forb/herb | LA(Jefferson) | ||
| Luziola | watergrass | Grass family | LA(Lafourche, Orleans) | |||
| Luziola fluitans | southern watergrass | Grass family | Graminoid | LA(Lafourche, Orleans) | ||
| Luzula | woodrush | Rush family | LA(Jefferson, Orleans) | |||
| Luzula bulbosa | bulbous woodrush | Rush family | Graminoid | LA(Jefferson, Orleans) | ||
| Lycium | desert-thorn | Potato family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Lycium carolinianum | Carolina desert-thorn | Potato family | Shrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Lycium carolinianum var. quadrifidum | Carolina desert-thorn | Potato family | Shrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Lycopodiella | clubmoss | Club-moss family | LA(Orleans) | |||
| Lycopodiella alopecuroides | foxtail clubmoss | Club-moss family | Subshrub, Forb/herb | LA(Orleans) | ||
| Lycopus | waterhorehound | Mint family | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | |||
| Lycopus rubellus | taperleaf water horehound | Mint family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Lycopus virginicus | Virginia water horehound | Mint family | Forb/herb | LA(St. Charles) | ||
| Lygodium | climbing fern | Climbing Fern family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Lythrum | loosestrife | Loosestrife family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Lythrum alatum | winged lythrum | Loosestrife family | Forb/herb, Subshrub | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Lythrum alatum var. lanceolatum | winged lythrum | Loosestrife family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Lythrum lineare | wand lythrum | Loosestrife family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Maclura | maclura | Mulberry family | LA(Terrebonne) | |||
| Maclura pomifera | Osage-orange | Mulberry family | Tree, Shrub | LA(Terrebonne) | ||
| Magnolia | magnolia | Magnolia family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | |||
| Magnolia grandiflora | southern magnolia | Magnolia family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Magnolia virginiana | sweetbay | Magnolia family | Tree, Shrub | LA(St. Charles) | ||
| Malachra | leafbract | Mallow family | LA(Orleans) | |||
| Malachra capitata | malva de caballo | Mallow family | Forb/herb | LA(Orleans) | ||
| Malus | apple | Rose family | LA(Orleans) | |||
| Malus angustifolia | southern crab apple | Rose family | Tree, Shrub | LA(Orleans) | ||
| Malvastrum | false mallow | Mallow family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Malvaviscus | wax mallow | Mallow family | LA(Orleans, St. Charles) | |||
| Malvaviscus arboreus | wax mallow | Mallow family | Subshrub, Shrub | LA(Orleans, St. Charles) | ||
| Malvaviscus arboreus var. drummondii | wax mallow | Mallow family | Subshrub, Shrub | LA(Orleans, St. Charles) | ||
| Manihot | cassava | Spurge family | LA(Orleans, St. Charles) | |||
| Marsilea | waterclover | Water-clover family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | |||
| Marsilea macropoda | bigfoot waterclover | Water-clover family | Forb/herb | LA(Orleans) | ||
| Marsilea vestita | hairy waterclover | Water-clover family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Matelea | milkvine | Milkweed family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Matelea gonocarpos | angularfruit milkvine | Milkweed family | Forb/herb, Vine | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Mecardonia | mecardonia | Figwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Mecardonia acuminata | axilflower | Figwort family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Mecardonia procumbens | baby jump-up | Figwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Melica | melicgrass | Grass family | LA(Lafourche) | |||
| Melica mutica | twoflower melicgrass | Grass family | Graminoid | LA(Lafourche) | ||
| Melochia | melochia | Cacao family | LA(Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Melothria | melothria | Cucumber family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Melothria pendula | Guadeloupe cucumber | Cucumber family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Melothria pendula var. pendula | Guadeloupe cucumber | Cucumber family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Mentha | mint | Mint family | LA(Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Mentha ×piperita | peppermint | Mint family | Forb/herb | LA(Terrebonne) | ||
| Merremia | woodrose | Morning-glory family | LA(Orleans) | |||
| Merremia dissecta | noyau vine | Morning-glory family | Vine, Forb/herb | LA(Orleans) | ||
| Micranthemum | mudflower | Figwort family | LA(Lafourche) | |||
| Micranthemum umbrosum | shade mudflower | Figwort family | Forb/herb | LA(Lafourche) | ||
| Mikania | hempvine | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Mikania cordifolia | Florida Keys hempvine | Aster family | Forb/herb, Vine | LA(Lafourche, St. Bernard) | ||
| Mikania scandens | climbing hempvine | Aster family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Mimosa | sensitive plant | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Mimosa microphylla | littleleaf sensitive-briar | Pea family | Vine, Forb/herb | LA(Orleans) | ||
| Mimosa strigillosa | powderpuff | Pea family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Mimulus | monkeyflower | Figwort family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Mimulus alatus | sharpwing monkeyflower | Figwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Mimulus ringens | Allegheny monkeyflower | Figwort family | Forb/herb | LA(St. Charles) | ||
| Mimulus ringens var. ringens | Allegheny monkeyflower | Figwort family | Forb/herb | LA(St. Charles) | ||
| Mirabilis | four o'clock | Four o'clock family | LA(Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Mitreola | hornpod | Logania family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Mitreola petiolata | lax hornpod | Logania family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Modiola | bristlemallow | Mallow family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Modiola caroliniana | Carolina bristlemallow | Mallow family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Mollugo | carpetweed | Carpet-weed family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Mollugo verticillata | green carpetweed | Carpet-weed family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Monarda | beebalm | Mint family | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | |||
| Monarda citriodora | lemon beebalm | Mint family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Monarda citriodora ssp. citriodora | lemon beebalm | Mint family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Monarda citriodora ssp. citriodora var. citriodora | lemon beebalm | Mint family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Monarda fistulosa | wild bergamot | Mint family | Subshrub, Forb/herb | LA(Jefferson) | ||
| Monarda fistulosa ssp. fistulosa | wild bergamot | Mint family | Subshrub, Forb/herb | LA(Jefferson) | ||
| Monarda fistulosa ssp. fistulosa var. fistulosa | wild bergamot | Mint family | Forb/herb | LA(Jefferson) | ||
| Monarda punctata | spotted beebalm | Mint family | Subshrub, Forb/herb | LA(Jefferson, St. Charles, Terrebonne) | ||
| Monarda punctata ssp. punctata | spotted beebalm | Mint family | Subshrub, Forb/herb | LA(Jefferson, St. Charles, Terrebonne) | ||
| Monarda punctata ssp. punctata var. punctata | spotted beebalm | Mint family | Forb/herb, Subshrub | LA(Jefferson, St. Charles, Terrebonne) | ||
| Morella | bayberry | Bayberry family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Morella caroliniensis | southern bayberry | Bayberry family | Shrub, Tree | LA(Jefferson, Orleans) | ||
| Morella cerifera | wax myrtle | Bayberry family | Tree, Subshrub, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Morus | mulberry | Mulberry family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Morus rubra | red mulberry | Mulberry family | Tree | LA(Jefferson, Lafourche, Terrebonne) | ||
| Morus rubra var. rubra | red mulberry | Mulberry family | Tree | LA(Jefferson, Lafourche, Terrebonne) | ||
| Muhlenbergia | muhly | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Muhlenbergia capillaris | hairawn muhly | Grass family | Graminoid | LA(Jefferson, Lafourche, Terrebonne) | ||
| Muhlenbergia schreberi | nimblewill | Grass family | Graminoid | LA(Orleans, St. Bernard, St. Charles) | ||
| Myosotis | forget-me-not | Borage family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Myosotis verna | spring forget-me-not | Borage family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Myosurus | mousetail | Buttercup family | LA(St. Charles) | |||
| Myosurus minimus | tiny mousetail | Buttercup family | Forb/herb | LA(St. Charles) | ||
| Myriophyllum | watermilfoil | Water Milfoil family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Myriophyllum pinnatum | cutleaf watermilfoil | Water Milfoil family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Najas | waternymph | Water-nymph family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Najas guadalupensis | southern waternymph | Water-nymph family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Najas guadalupensis ssp. guadalupensis | southern waternymph | Water-nymph family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Nama | fiddleleaf | Waterleaf family | LA(Orleans) | |||
| Nama jamaicense | Jamaicanweed | Waterleaf family | Forb/herb | LA(Orleans) | ||
| Neeragrostis | creeping lovegrass | Grass family | LA(St. Charles) | |||
| Neeragrostis reptans | creeping lovegrass | Grass family | Graminoid | LA(St. Charles) | ||
| Nekemias | peppervine | Grape family | Shrub, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Nekemias arborea | peppervine | Grape family | Shrub, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Nelumbo | lotus | Lotus-lily family | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | |||
| Nelumbo lutea | American lotus | Lotus-lily family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Nemophila | baby blue eyes | Waterleaf family | LA(Jefferson, Orleans, Terrebonne) | |||
| Nemophila aphylla | smallflower baby blue eyes | Waterleaf family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Neobeckia | lakecress | Mustard family | LA(Lafourche, Terrebonne) | |||
| Neobeckia aquatica | lakecress | Mustard family | Forb/herb | LA(Lafourche, Terrebonne) | ||
| Nephrolepis | swordfern | Wood Fern family | LA(Jefferson, Orleans) | |||
| Nephrolepis biserrata | giant swordfern | Wood Fern family | Forb/herb | LA(Jefferson) | ||
| Nephrolepis exaltata | Boston swordfern | Wood Fern family | Forb/herb | LA(Orleans) | ||
| Nephrolepis exaltata ssp. exaltata | Boston swordfern | Wood Fern family | Forb/herb | LA(Orleans) | ||
| Nicotiana | tobacco | Potato family | LA(St. Bernard, Terrebonne) | |||
| Nothoscordum | false garlic | Lily family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Nothoscordum bivalve | crowpoison | Lily family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Nuphar | pond-lily | Water-lily family | LA(Terrebonne) | |||
| Nuphar lutea | yellow pond-lily | Water-lily family | Forb/herb | LA(Terrebonne) | ||
| Nuphar lutea ssp. advena | yellow pond-lily | Water-lily family | Forb/herb | LA(Terrebonne) | ||
| Nuttallanthus | toadflax | Figwort family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Nuttallanthus canadensis | Canada toadflax | Figwort family | Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Nuttallanthus texanus | Texas toadflax | Figwort family | Forb/herb | LA(Jefferson) | ||
| Nymphaea | waterlily | Water-lily family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Nymphaea mexicana | yellow waterlily | Water-lily family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Nymphaea odorata | American white waterlily | Water-lily family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Nymphaea odorata ssp. odorata | American white waterlily | Water-lily family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Nyssa | tupelo | Dogwood family | LA(Jefferson, St. Charles, Terrebonne) | |||
| Nyssa aquatica | water tupelo | Dogwood family | Tree | LA(Jefferson, St. Charles, Terrebonne) | ||
| Nyssa sylvatica | blackgum | Dogwood family | Tree | LA(St. Charles) | ||
| Ocimum | basil | Mint family | LA(Orleans) | |||
| Oenothera | evening primrose | Evening Primrose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Oenothera biennis | common evening primrose | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Oenothera curtiflora | velvetweed | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Oenothera filiformis | longflower beeblossom | Forb/herb | LA(Jefferson, Lafourche, Orleans) | |||
| Oenothera grandis | showy evening primrose | Evening Primrose family | Forb/herb | LA(Jefferson, Terrebonne) | ||
| Oenothera humifusa | seabeach evening primrose | Evening Primrose family | Subshrub, Forb/herb | LA(Jefferson, Orleans) | ||
| Oenothera laciniata | cutleaf evening primrose | Evening Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Oenothera lindheimeri | Lindheimer's beeblossom | Forb/herb | LA(Orleans) | |||
| Oenothera speciosa | pinkladies | Evening Primrose family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Oldenlandia | oldenlandia | Madder family | LA(Orleans) | |||
| Oldenlandia boscii | Bosc's mille graines | Madder family | Forb/herb | LA(Orleans) | ||
| Oldenlandia corymbosa | flat-top mille graines | Madder family | Forb/herb | LA(Orleans) | ||
| Onoclea | sensitive fern | Wood Fern family | LA(Orleans) | |||
| Onoclea sensibilis | sensitive fern | Wood Fern family | Forb/herb | LA(Orleans) | ||
| Onosmodium | marbleseed | Borage family | LA(St. Bernard) | |||
| Onosmodium bejariense | soft-hair marbleseed | Borage family | Forb/herb | LA(St. Bernard) | ||
| Onosmodium bejariense var. bejariense | soft-hair marbleseed | Borage family | Forb/herb | LA(St. Bernard) | ||
| Onosmodium bejariense var. hispidissimum | softhair marbleseed | Borage family | Forb/herb | LA(St. Bernard) | ||
| Ophioglossum | adderstongue | Adder's-tongue family | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | |||
| Ophioglossum crotalophoroides | bulbous adderstongue | Adder's-tongue family | Forb/herb | LA(Jefferson, Lafourche, Terrebonne) | ||
| Ophioglossum crotalophoroides var. crotalophoroides | bulbous adderstongue | Adder's-tongue family | Forb/herb | LA(Jefferson, Lafourche, Terrebonne) | ||
| Ophioglossum petiolatum | longstem adderstongue | Adder's-tongue family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard) | ||
| Ophioglossum vulgatum | southern adderstongue | Adder's-tongue family | Forb/herb | LA(St. Charles) | ||
| Oplismenus | basketgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Oplismenus hirtellus | basketgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Oplismenus hirtellus ssp. setarius | basketgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Opuntia | pricklypear | Cactus family | LA(St. Charles, Terrebonne) | |||
| Opuntia engelmannii | cactus apple | Cactus family | Shrub | LA(St. Charles) | ||
| Opuntia engelmannii var. lindheimeri | Texas pricklypear | Cactus family | Shrub | LA(St. Charles) | ||
| Opuntia humifusa | devil's-tongue | Cactus family | Shrub | LA(Terrebonne) | ||
| Opuntia stricta | erect pricklypear | Cactus family | Shrub | LA(St. Charles) | ||
| Orontium | goldenclub | Arum family | LA(Orleans) | |||
| Orontium aquaticum | goldenclub | Arum family | Forb/herb | LA(Orleans) | ||
| Osmunda | osmunda | Royal Fern family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Osmunda cinnamomea | cinnamon fern | Royal Fern family | Forb/herb | LA(Orleans) | ||
| Osmunda cinnamomea var. cinnamomea | cinnamon fern | Royal Fern family | Forb/herb | LA(Orleans) | ||
| Osmunda regalis | royal fern | Royal Fern family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Osmunda regalis var. spectabilis | royal fern | Royal Fern family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Oxalis | woodsorrel | Wood-Sorrel family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Oxalis corniculata | creeping woodsorrel | Wood-Sorrel family | Forb/herb | LA(St. Bernard, Terrebonne) | ||
| Oxalis stricta | common yellow oxalis | Wood-Sorrel family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Oxycaryum | bulrush | Sedge family | LA(Lafourche, St. Charles, Terrebonne) | |||
| Oxycaryum cubense | Cuban bulrush | Sedge family | Graminoid | LA(Lafourche, St. Charles, Terrebonne) | ||
| Oxypolis | cowbane | Carrot family | LA(Lafourche) | |||
| Oxypolis rigidior | stiff cowbane | Carrot family | Forb/herb | LA(Lafourche) | ||
| Packera | ragwort | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Packera glabella | butterweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Packera tampicana | Great Plains ragwort | Aster family | Forb/herb | LA(Jefferson, Orleans) | ||
| Panicum | panicgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Panicum amarum | bitter panicgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Panicum anceps | beaked panicgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Panicum capillare | witchgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Panicum dichotomiflorum | fall panicgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Panicum dichotomiflorum var. dichotomiflorum | fall panicgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Panicum hemitomon | maidencane | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Panicum rigidulum | redtop panicgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Panicum rigidulum var. rigidulum | redtop panicgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Panicum verrucosum | warty panicgrass | Grass family | Graminoid | LA(Jefferson) | ||
| Panicum virgatum | switchgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Panicum virgatum var. virgatum | switchgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Parietaria | pellitory | Nettle family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Parietaria floridana | Florida pellitory | Nettle family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Parietaria pensylvanica | Pennsylvania pellitory | Nettle family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Parietaria praetermissa | clustered pellitory | Nettle family | Forb/herb | LA(Orleans) | ||
| Parkinsonia | paloverde | Pea family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Parkinsonia aculeata | Jerusalem thorn | Pea family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Parthenium | feverfew | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Parthenocissus | creeper | Grape family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Parthenocissus quinquefolia | Virginia creeper | Grape family | Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Paspalum | crowngrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Paspalum acuminatum | brook crowngrass | Grass family | Graminoid | LA(Orleans) | ||
| Paspalum boscianum | bull crowngrass | Grass family | Graminoid | LA(Orleans) | ||
| Paspalum conjugatum | hilograss | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Paspalum denticulatum | longtom | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Paspalum dissectum | mudbank crowngrass | Grass family | Graminoid | LA(Jefferson, St. Bernard, St. Charles, Terrebonne) | ||
| Paspalum distichum | knotgrass | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Paspalum fluitans | horsetail paspalum | Grass family | Graminoid | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Paspalum laeve | field paspalum | Grass family | Graminoid | LA(St. Charles) | ||
| Paspalum langei | rustyseed paspalum | Grass family | Graminoid | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Paspalum notatum | bahiagrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Paspalum plicatulum | brownseed paspalum | Grass family | Graminoid | LA(Orleans, St. Bernard) | ||
| Paspalum pubiflorum | hairyseed paspalum | Grass family | Graminoid | LA(Lafourche, Orleans, St. Bernard) | ||
| Paspalum vaginatum | seashore paspalum | Grass family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Passiflora | passionflower | Passion-flower family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Passiflora incarnata | purple passionflower | Passion-flower family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Passiflora lutea | yellow passionflower | Passion-flower family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Pectis | chinchweed | Aster family | LA(Jefferson) | |||
| Pectis prostrata | spreading chinchweed | Aster family | Forb/herb | LA(Jefferson) | ||
| Pennisetum | fountaingrass | Grass family | LA(Orleans) | |||
| Penthorum | penthorum | Stonecrop family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Penthorum sedoides | ditch stonecrop | Stonecrop family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Pentodon | pentodon | Madder family | LA(Lafourche) | |||
| Pentodon pentandrus | Hale's pentodon | Madder family | Forb/herb | LA(Lafourche) | ||
| Persea | bay | Laurel family | LA(Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Persea borbonia | redbay | Laurel family | Tree, Shrub | LA(Lafourche) | ||
| Persea palustris | swamp bay | Laurel family | Shrub, Tree | LA(Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Phalaris | canarygrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Phalaris angusta | timothy canarygrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Phalaris caroliniana | Carolina canarygrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Phanopyrum | savannah-panicgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Phanopyrum gymnocarpon | savannah-panicgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Philadelphus | mock orange | Hydrangea family | LA(Lafourche, Orleans) | |||
| Philadelphus inodorus | scentless mock orange | Hydrangea family | Shrub | LA(Lafourche, Orleans) | ||
| Phleum | timothy | Grass family | LA(Orleans, Terrebonne) | |||
| Phlox | phlox | Phlox family | LA(Jefferson, Orleans) | |||
| Phlox drummondii | annual phlox | Phlox family | Forb/herb | LA(Jefferson, Orleans) | ||
| Phlox drummondii ssp. drummondii | annual phlox | Phlox family | Forb/herb | LA(Jefferson, Orleans) | ||
| Phoradendron | mistletoe | Christmas Mistletoe family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Phoradendron leucarpum | oak mistletoe | Christmas Mistletoe family | Subshrub, Shrub | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Phragmites | reed | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Phragmites australis | common reed | Grass family | Subshrub, Shrub, Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Phragmites australis ssp. berlandieri | subtropical common reed | Grass family | Graminoid | LA(Orleans) | ||
| Phyla | fogfruit | Verbena family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Phyla ×intermedia | fogfruit | Verbena family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Phyla cuneifolia | wedgeleaf | Verbena family | Subshrub, Forb/herb | LA(Lafourche, Orleans) | ||
| Phyla lanceolata | lanceleaf fogfruit | Verbena family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Phyla nodiflora | turkey tangle fogfruit | Verbena family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Phyllanthus | leafflower | Spurge family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Phyllanthus caroliniensis | Carolina leaf-flower | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, Terrebonne) | ||
| Phyllanthus caroliniensis ssp. caroliniensis | Carolina leaf-flower | Spurge family | Forb/herb | LA(Jefferson, Lafourche, Orleans, Terrebonne) | ||
| Phyllanthus polygonoides | smartweed leaf-flower | Spurge family | Forb/herb, Subshrub | LA(St. Charles) | ||
| Phyllanthus pudens | birdseed leaf-flower | Spurge family | Forb/herb | LA(St. Charles, Terrebonne) | ||
| Physalis | groundcherry | Potato family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Physalis angulata | cutleaf groundcherry | Potato family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Physalis angustifolia | coastal groundcherry | Potato family | Forb/herb, Subshrub | LA(Jefferson, St. Bernard) | ||
| Physalis cordata | heartleaf groundcherry | Potato family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Physalis pubescens | husk tomato | Potato family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Physostegia | lionsheart | Mint family | LA(St. Charles) | |||
| Physostegia correllii | Correll's false dragonhead | Mint family | Forb/herb | LA(St. Charles) | ||
| Phytolacca | pokeweed | Pokeweed family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Phytolacca americana | American pokeweed | Pokeweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Pilea | clearweed | Nettle family | LA(Jefferson, Lafourche, Orleans, St. Charles) | |||
| Pilea microphylla | rockweed | Nettle family | Subshrub, Forb/herb | LA(Lafourche, Orleans) | ||
| Pilea pumila | Canadian clearweed | Nettle family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Pinus | pine | Pine family | LA(Jefferson, Lafourche, Orleans, St. Charles) | |||
| Pinus echinata | shortleaf pine | Pine family | Tree | LA(St. Charles) | ||
| Pinus elliottii | slash pine | Pine family | Tree | LA(Jefferson, Lafourche, Orleans) | ||
| Pinus elliottii var. elliottii | slash pine | Pine family | Tree | LA(Jefferson, Lafourche, Orleans) | ||
| Pinus glabra | spruce pine | Pine family | Tree | LA(Orleans, St. Charles) | ||
| Pinus taeda | loblolly pine | Pine family | Tree | LA(Orleans, St. Charles) | ||
| Pistia | pistia | Arum family | LA(Lafourche, Orleans, Terrebonne) | |||
| Pistia stratiotes | water lettuce | Arum family | Forb/herb | LA(Lafourche, Orleans, Terrebonne) | ||
| Pityopsis | silkgrass | Aster family | LA(St. Charles) | |||
| Pityopsis graminifolia | narrowleaf silkgrass | Aster family | Forb/herb | LA(St. Charles) | ||
| Planera | planertree | Elm family | LA(Jefferson, St. Charles) | |||
| Planera aquatica | planertree | Elm family | Tree | LA(Jefferson, St. Charles) | ||
| Plantago aristata | largebracted plantain | Plantain family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Plantago heterophylla | slender plantain | Plantain family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Plantago rhodosperma | redseed plantain | Plantain family | Forb/herb | LA(Orleans) | ||
| Plantago rugelii | blackseed plantain | Plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard) | ||
| Plantago rugelii var. rugelii | blackseed plantain | Plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard) | ||
| Plantago virginica | Virginia plantain | Plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Plantago wrightiana | Wright's plantain | Plantain family | Forb/herb | LA(Orleans) | ||
| Platanus | sycamore | Plane-tree family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Platanus occidentalis | American sycamore | Plane-tree family | Tree | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Pleopeltis | scaly polypody | Polypody family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Pleopeltis polypodioides | resurrection fern | Polypody family | Forb/herb, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Pleopeltis polypodioides ssp. michauxiana | resurrection fern | Polypody family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Pluchea | camphorweed | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Pluchea camphorata | camphor pluchea | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Pluchea foetida | stinking camphorweed | Aster family | Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Pluchea foetida var. foetida | stinking camphorweed | Aster family | Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Pluchea odorata | sweetscent | Aster family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Pluchea odorata var. odorata | sweetscent | Aster family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Plumbago | leadwort | Leadwort family | LA(Orleans) | |||
| Poa | bluegrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Poa autumnalis | autumn bluegrass | Grass family | Graminoid | LA(Orleans, St. Charles) | ||
| Poa pratensis | Kentucky bluegrass | Grass family | Graminoid | LA(Orleans, Terrebonne) | ||
| Polygala | polygala | Milkwort family | LA(Orleans) | |||
| Polygala cymosa | tall pinebarren milkwort | Milkwort family | Forb/herb | LA(Orleans) | ||
| Polygonum glabrum | denseflower knotweed | Buckwheat family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Polygonum hydropiperoides | swamp smartweed | Buckwheat family | Forb/herb | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Polygonum lapathifolium | curlytop knotweed | Buckwheat family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Polygonum pensylvanicum | Pennsylvania smartweed | Buckwheat family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Polygonum punctatum | dotted smartweed | Buckwheat family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Polygonum ramosissimum | bushy knotweed | Buckwheat family | Forb/herb | LA(Jefferson) | ||
| Polygonum ramosissimum var. prolificum | bushy knotweed | Buckwheat family | Forb/herb | LA(Jefferson) | ||
| Polygonum ramosissimum var. ramosissimum | bushy knotweed | Buckwheat family | Forb/herb | LA(Jefferson) | ||
| Polygonum scandens | climbing false buckwheat | Buckwheat family | Vine, Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Polygonum scandens var. cristatum | climbing false buckwheat | Buckwheat family | Vine, Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Polygonum setaceum | bog smartweed | Buckwheat family | Forb/herb | LA(Jefferson, St. Bernard, St. Charles) | ||
| Polygonum tenue | pleatleaf knotweed | Buckwheat family | Forb/herb | LA(Orleans) | ||
| Polygonum virginianum | jumpseed | Buckwheat family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | ||
| Polypogon | rabbitsfoot grass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Polypogon interruptus | ditch rabbitsfoot grass | Grass family | Graminoid | LA(Jefferson, St. Bernard, St. Charles) | ||
| Polypremum | polypremum | Butterfly-bush family | LA(Jefferson, Orleans, St. Bernard, St. Charles) | |||
| Polypremum procumbens | juniper leaf | Butterfly-bush family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Pontederia | pickerelweed | Water-Hyacinth family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Pontederia cordata | pickerelweed | Water-Hyacinth family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Populus | cottonwood | Willow family | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Populus deltoides | eastern cottonwood | Willow family | Tree | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Populus deltoides ssp. deltoides | eastern cottonwood | Willow family | Tree | LA(Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Portulaca | purslane | Purslane family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Portulaca oleracea | little hogweed | Purslane family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Portulaca pilosa | kiss me quick | Purslane family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Potamogeton | pondweed | Pondweed family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Potamogeton diversifolius | waterthread pondweed | Pondweed family | Forb/herb | LA(Lafourche, Orleans) | ||
| Potamogeton perfoliatus | claspingleaf pondweed | Pondweed family | Forb/herb | LA(Orleans) | ||
| Potamogeton pusillus | small pondweed | Pondweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Potamogeton pusillus ssp. pusillus | small pondweed | Pondweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Potentilla | cinquefoil | Rose family | LA(Orleans) | |||
| Potentilla simplex | common cinquefoil | Rose family | Forb/herb | LA(Orleans) | ||
| Proserpinaca | mermaidweed | Water Milfoil family | LA(Orleans) | |||
| Proserpinaca pectinata | combleaf mermaidweed | Water Milfoil family | Forb/herb | LA(Orleans) | ||
| Prunella | selfheal | Mint family | LA(St. Charles) | |||
| Prunella vulgaris | common selfheal | Mint family | Forb/herb | LA(St. Charles) | ||
| Prunus | plum | Rose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Prunus angustifolia | Chickasaw plum | Rose family | Tree, Shrub | LA(Jefferson, Orleans) | ||
| Prunus angustifolia var. angustifolia | Chickasaw plum | Rose family | Tree, Shrub | LA(Jefferson, Orleans) | ||
| Prunus caroliniana | Carolina laurelcherry | Rose family | Tree, Shrub | LA(Lafourche, Orleans, St. Bernard) | ||
| Prunus mexicana | Mexican plum | Rose family | Tree, Shrub | LA(Orleans) | ||
| Prunus serotina | black cherry | Rose family | Tree, Shrub | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Prunus serotina var. serotina | black cherry | Rose family | Shrub, Tree | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Pseudognaphalium | cudweed | Aster family | LA(Jefferson, Orleans) | |||
| Pseudognaphalium obtusifolium | rabbit-tobacco | Aster family | Forb/herb | LA(Jefferson, Orleans) | ||
| Pseudognaphalium obtusifolium ssp. obtusifolium | rabbit-tobacco | Aster family | Forb/herb | LA(Jefferson, Orleans) | ||
| Psilotum | whisk fern | Whisk-fern family | LA(Orleans, St. Charles, Terrebonne) | |||
| Psilotum nudum | whisk fern | Whisk-fern family | Forb/herb | LA(Orleans, St. Charles, Terrebonne) | ||
| Pteridium | brackenfern | Bracken Fern family | LA(Orleans) | |||
| Pteridium aquilinum | western brackenfern | Bracken Fern family | Forb/herb | LA(Orleans) | ||
| Pteris | brake fern | Maidenhair Fern family | LA(Jefferson, Orleans, St. Bernard, St. Charles) | |||
| Ptilimnium | mock bishopweed | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ptilimnium capillaceum | herbwilliam | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ptilimnium costatum | ribbed mock bishopweed | Carrot family | Forb/herb | LA(Terrebonne) | ||
| Ptilimnium nuttallii | laceflower | Carrot family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Pyrrhopappus | desert-chicory | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Pyrrhopappus carolinianus | Carolina desert-chicory | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Quercus | oak | Beech family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Quercus ×comptoniae | Compton oak | Beech family | Tree | LA(Orleans) | ||
| Quercus falcata | southern red oak | Beech family | Tree | LA(Orleans) | ||
| Quercus laurifolia | laurel oak | Beech family | Tree | LA(Lafourche, Orleans, St. Charles) | ||
| Quercus lyrata | overcup oak | Beech family | Tree | LA(Lafourche, Orleans, St. Charles) | ||
| Quercus margaretta | sand post oak | Beech family | Shrub, Tree | LA(St. Bernard) | ||
| Quercus michauxii | swamp chestnut oak | Beech family | Tree | LA(Orleans) | ||
| Quercus nigra | water oak | Beech family | Tree | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Quercus pagoda | cherrybark oak | Beech family | Tree | LA(Jefferson, Orleans, St. Charles) | ||
| Quercus shumardii | Shumard's oak | Beech family | Tree, Shrub | LA(St. Charles) | ||
| Quercus shumardii var. shumardii | Shumard oak | Beech family | Tree, Shrub | LA(St. Charles) | ||
| Quercus stellata | post oak | Beech family | Tree | LA(Jefferson) | ||
| Quercus texana | Nuttall oak | Beech family | Tree, Shrub | LA(Jefferson, Orleans, St. Charles) | ||
| Quercus virginiana | live oak | Beech family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ranunculus | buttercup | Buttercup family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ranunculus hispidus | bristly buttercup | Buttercup family | Forb/herb | LA(St. Charles) | ||
| Ranunculus hispidus var. nitidus | bristly buttercup | Buttercup family | Forb/herb | LA(St. Charles) | ||
| Ranunculus pusillus | low spearwort | Buttercup family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ranunculus pusillus var. angustifolius | low spearwort | Buttercup family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ranunculus recurvatus | blisterwort | Buttercup family | Forb/herb | LA(Orleans) | ||
| Ranunculus recurvatus var. recurvatus | blisterwort | Buttercup family | Forb/herb | LA(Orleans) | ||
| Ranunculus sceleratus | cursed buttercup | Buttercup family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ranunculus sceleratus var. sceleratus | cursed buttercup | Buttercup family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rayjacksonia | tansyaster | Aster family | LA(Terrebonne) | |||
| Rayjacksonia phyllocephala | camphor daisy | Aster family | Forb/herb | LA(Terrebonne) | ||
| Rhus | sumac | Sumac family | LA(Orleans, Terrebonne) | |||
| Rhus glabra | smooth sumac | Sumac family | Tree, Shrub | LA(Orleans, Terrebonne) | ||
| Rhynchosia | snoutbean | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Rhynchosia minima | least snoutbean | Pea family | Subshrub, Forb/herb, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rhynchospora | beaksedge | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Rhynchospora caduca | anglestem beaksedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, St. Charles) | ||
| Rhynchospora colorata | starrush whitetop | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rhynchospora corniculata | shortbristle horned beaksedge | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rhynchospora glomerata | clustered beaksedge | Sedge family | Graminoid | LA(Terrebonne) | ||
| Rhynchospora grayi | Gray's beaksedge | Sedge family | Graminoid | LA(St. Charles) | ||
| Rhynchospora inexpansa | nodding beaksedge | Sedge family | Graminoid | LA(Terrebonne) | ||
| Rhynchospora latifolia | sandswamp whitetop | Sedge family | Graminoid | LA(Terrebonne) | ||
| Rhynchospora miliacea | millet beaksedge | Sedge family | Graminoid | LA(Terrebonne) | ||
| Richardia | Mexican clover | Madder family | LA(Orleans) | |||
| Richardia brasiliensis | tropical Mexican clover | Madder family | Forb/herb | LA(Orleans) | ||
| Richardia scabra | rough Mexican clover | Madder family | Forb/herb | LA(Orleans) | ||
| Rivina | rivina | Pokeweed family | LA(Jefferson, Orleans, St. Charles) | |||
| Rivina humilis | rougeplant | Pokeweed family | Forb/herb, Shrub | LA(Jefferson, Orleans, St. Charles) | ||
| Robinia | locust | Pea family | LA(Orleans, St. Bernard, St. Charles) | |||
| Robinia pseudoacacia | black locust | Pea family | Tree | LA(Orleans, St. Bernard, St. Charles) | ||
| Rorippa | yellowcress | Mustard family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Rorippa palustris | bog yellowcress | Mustard family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rorippa palustris ssp. fernaldiana | Fernald's yellowcress | Mustard family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rorippa sessiliflora | stalkless yellowcress | Mustard family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Rorippa sinuata | spreading yellowcress | Mustard family | Forb/herb | LA(St. Charles) | ||
| Rorippa teres | southern marsh yellowcress | Mustard family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Rosa | rose | Rose family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Rotala | rotala | Loosestrife family | LA(Orleans, St. Charles) | |||
| Rotala ramosior | lowland rotala | Loosestrife family | Forb/herb | LA(Orleans, St. Charles) | ||
| Rubus | blackberry | Rose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Rubus aboriginum | garden dewberry | Rose family | Subshrub | LA(St. Charles) | ||
| Rubus argutus | sawtooth blackberry | Rose family | Subshrub | LA(Orleans, St. Charles, Terrebonne) | ||
| Rubus flagellaris | northern dewberry | Rose family | Subshrub | LA(Jefferson, Orleans, Terrebonne) | ||
| Rubus trivialis | southern dewberry | Rose family | Subshrub, Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ruellia | wild petunia | Acanthus family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ruellia caroliniensis | Carolina wild petunia | Acanthus family | Forb/herb | LA(Orleans) | ||
| Ruellia caroliniensis ssp. caroliniensis | Carolina wild petunia | Acanthus family | Forb/herb | LA(Orleans) | ||
| Ruellia caroliniensis ssp. caroliniensis var. caroliniensis | Carolina wild petunia | Acanthus family | Forb/herb | LA(Orleans) | ||
| Ruellia nudiflora | violet wild petunia | Acanthus family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Ruellia nudiflora var. nudiflora | violet wild petunia | Acanthus family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Rumex altissimus | pale dock | Buckwheat family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Rumex chrysocarpus | amamastla | Buckwheat family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Rumex hastatulus | heartwing sorrel | Buckwheat family | Forb/herb | LA(Lafourche, Orleans) | ||
| Rumex verticillatus | swamp dock | Buckwheat family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Ruppia | widgeonweed | Ditch-grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Ruppia maritima | widgeongrass | Ditch-grass family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Sabal | palmetto | Palm family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sabal minor | dwarf palmetto | Palm family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sabal palmetto | cabbage palmetto | Palm family | Tree | LA(Orleans, St. Charles) | ||
| Sabatia | rose gentian | Gentian family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sabatia arenicola | sand rose gentian | Gentian family | Forb/herb | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Sabatia brachiata | narrowleaf rose gentian | Gentian family | Forb/herb | LA(Orleans) | ||
| Sabatia calycina | coastal rose gentian | Gentian family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Sabatia campanulata | slender rose gentian | Gentian family | Forb/herb | LA(Terrebonne) | ||
| Sabatia stellaris | rose of Plymouth | Gentian family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Saccharum | sugarcane | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Saccharum giganteum | sugarcane plumegrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sacciolepis | cupscale grass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sacciolepis striata | American cupscale | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sagina | pearlwort | Pink family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Sagina decumbens | trailing pearlwort | Pink family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Sagina decumbens ssp. decumbens | trailing pearlwort | Pink family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Sagittaria | arrowhead | Water-plantain family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sagittaria calycina | hooded arrowhead | Water-plantain family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Sagittaria calycina var. calycina | hooded arrowhead | Water-plantain family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Sagittaria graminea | grassy arrowhead | Water-plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Sagittaria lancifolia | bulltongue arrowhead | Water-plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Sagittaria lancifolia ssp. media | bulltongue arrowhead | Water-plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Sagittaria latifolia | broadleaf arrowhead | Water-plantain family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Sagittaria platyphylla | delta arrowhead | Water-plantain family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Salicornia | pickleweed | Goosefoot family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Salicornia bigelovii | dwarf saltwort | Goosefoot family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Salicornia depressa | Virginia glasswort | Goosefoot family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Salix | willow | Willow family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Salix interior | sandbar willow | Willow family | Shrub, Tree | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Salix nigra | black willow | Willow family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Salvia | sage | Mint family | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Salvia coccinea | blood sage | Mint family | Subshrub, Forb/herb | LA(Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Salvia lyrata | lyreleaf sage | Mint family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Sambucus | elderberry | Honeysuckle family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sambucus nigra | black elderberry | Honeysuckle family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sambucus nigra ssp. canadensis | American black elderberry | Honeysuckle family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Samolus | brookweed | Primrose family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Samolus valerandi | seaside brookweed | Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Samolus valerandi ssp. parviflorus | seaside brookweed | Primrose family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sanicula | sanicle | Carrot family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sanicula canadensis | Canadian blacksnakeroot | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sanicula canadensis var. canadensis | Canadian blacksnakeroot | Carrot family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sapindus | soapberry | Soapberry family | LA(Orleans) | |||
| Sapindus saponaria | wingleaf soapberry | Soapberry family | Tree, Shrub | LA(Orleans) | ||
| Sapindus saponaria var. drummondii | western soapberry | Soapberry family | Tree, Shrub | LA(Orleans) | ||
| Saururus | saururus | Lizard's-tail family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Saururus cernuus | lizard's tail | Lizard's-tail family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Scaevola | naupaka | Goodenia family | LA(Jefferson) | |||
| Scaevola plumieri | gullfeed | Goodenia family | Subshrub, Shrub, Forb/herb | LA(Jefferson) | ||
| Schedonorus | fescue | Grass family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Schizachyrium | little bluestem | Grass family | LA(Jefferson, Terrebonne) | |||
| Schizachyrium maritimum | gulf bluestem | Grass family | Graminoid | LA(Jefferson, Terrebonne) | ||
| Schizachyrium scoparium | little bluestem | Grass family | Graminoid | LA(Jefferson) | ||
| Schizachyrium scoparium var. divergens | little bluestem | Grass family | Graminoid | LA(Jefferson) | ||
| Schoenoplectus | bulrush | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Schoenoplectus americanus | chairmaker's bulrush | Sedge family | Graminoid | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Schoenoplectus californicus | California bulrush | Sedge family | Graminoid | LA(Jefferson, Lafourche, St. Bernard, St. Charles, Terrebonne) | ||
| Schoenoplectus pungens | common threesquare | Sedge family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Schoenoplectus pungens var. pungens | common threesquare | Sedge family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Schoenoplectus tabernaemontani | softstem bulrush | Sedge family | Graminoid | LA(Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Scirpus | bulrush | Sedge family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Scirpus atrovirens | green bulrush | Sedge family | Graminoid | LA(Orleans, St. Charles) | ||
| Scirpus cyperinus | woolgrass | Sedge family | Graminoid | LA(Orleans, St. Charles, Terrebonne) | ||
| Scirpus divaricatus | spreading bulrush | Sedge family | Graminoid | LA(St. Charles, Terrebonne) | ||
| Scirpus lineatus | drooping bulrush | Sedge family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Scutellaria | skullcap | Mint family | LA(Orleans, St. Bernard, Terrebonne) | |||
| Scutellaria drummondii | Drummond's skullcap | Mint family | Forb/herb | LA(Orleans) | ||
| Scutellaria drummondii var. drummondii | Drummond's skullcap | Mint family | Forb/herb | LA(Orleans) | ||
| Scutellaria lateriflora | blue skullcap | Mint family | Forb/herb | LA(Terrebonne) | ||
| Scutellaria lateriflora var. lateriflora | blue skullcap | Mint family | Forb/herb | LA(Terrebonne) | ||
| Scutellaria ovata | heartleaf skullcap | Mint family | Forb/herb | LA(Orleans, St. Bernard, Terrebonne) | ||
| Selaginella | spikemoss | Spike-moss family | LA(Orleans) | |||
| Senecio | ragwort | Aster family | LA(Orleans, Terrebonne) | |||
| Senna | senna | Pea family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Senna marilandica | Maryland senna | Pea family | Subshrub, Forb/herb | LA(Orleans) | ||
| Senna obtusifolia | Java-bean | Pea family | Forb/herb, Subshrub | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Serenoa | serenoa | Palm family | LA(Orleans) | |||
| Serenoa repens | saw palmetto | Palm family | Tree, Shrub | LA(Orleans) | ||
| Sesbania | riverhemp | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sesbania drummondii | poisonbean | Pea family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sesbania herbacea | bigpod sesbania | Pea family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sesuvium | seapurslane | Fig-marigold family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Sesuvium maritimum | slender seapurslane | Fig-marigold family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Sesuvium portulacastrum | shoreline seapurslane | Fig-marigold family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Sesuvium portulacastrum var. portulacastrum | shoreline seapurslane | Fig-marigold family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Setaria | bristlegrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Setaria magna | giant bristlegrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Setaria parviflora | marsh bristlegrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sibara | winged rockcress | Mustard family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Sibara virginica | Virginia winged rockcress | Mustard family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Sicyos | bur cucumber | Cucumber family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Sicyos angulatus | oneseed bur cucumber | Cucumber family | Forb/herb, Vine | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Sida | fanpetals | Mallow family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sida rhombifolia | Cuban jute | Mallow family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sida spinosa | prickly fanpetals | Mallow family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sideroxylon | bully | Sapodilla family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Sideroxylon lanuginosum | gum bully | Sapodilla family | Tree, Shrub | LA(Jefferson, Orleans) | ||
| Sideroxylon lanuginosum ssp. oblongifolium | gum bully | Sapodilla family | Tree | LA(Jefferson, Orleans) | ||
| Sideroxylon lycioides | buckthorn bully | Sapodilla family | Tree, Shrub | LA(Jefferson, St. Charles, Terrebonne) | ||
| Silene | catchfly | Pink family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Silene antirrhina | sleepy silene | Pink family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Sisymbrium | hedgemustard | Mustard family | LA(Orleans, St. Charles, Terrebonne) | |||
| Sisyrinchium | blue-eyed grass | Iris family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sisyrinchium angustifolium | narrowleaf blue-eyed grass | Iris family | Forb/herb | LA(Orleans, St. Bernard, St. Charles) | ||
| Sisyrinchium atlanticum | eastern blue-eyed grass | Iris family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sisyrinchium biforme | wiry blue-eyed grass | Iris family | Forb/herb | LA(Jefferson, St. Charles) | ||
| Sisyrinchium minus | dwarf blue-eyed grass | Iris family | Forb/herb | LA(Orleans, St. Charles) | ||
| Sisyrinchium rosulatum | annual blue-eyed grass | Iris family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Sisyrinchium sagittiferum | spearbract blue-eyed grass | Iris family | Forb/herb | LA(Orleans) | ||
| Sium | waterparsnip | Carrot family | LA(Orleans) | |||
| Sium suave | hemlock waterparsnip | Carrot family | Forb/herb | LA(Orleans) | ||
| Smallanthus | smallanthus | Aster family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Smallanthus uvedalius | hairy leafcup | Aster family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Smilax | greenbrier | Catbrier family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Smilax auriculata | earleaf greenbrier | Catbrier family | Shrub, Vine | LA(St. Bernard) | ||
| Smilax bona-nox | saw greenbrier | Catbrier family | Shrub, Vine | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Smilax bona-nox var. bona-nox | saw greenbrier | Catbrier family | Shrub, Vine | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Smilax glauca | cat greenbrier | Catbrier family | Shrub, Vine | LA(Orleans, St. Charles) | ||
| Smilax rotundifolia | roundleaf greenbrier | Catbrier family | Vine, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Smilax smallii | lanceleaf greenbrier | Catbrier family | Shrub, Vine | LA(Orleans, St. Bernard) | ||
| Smilax tamnoides | bristly greenbrier | Catbrier family | Vine, Shrub | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Smilax walteri | coral greenbrier | Catbrier family | Shrub, Vine | LA(Lafourche) | ||
| Solanum | nightshade | Potato family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Solanum americanum | American black nightshade | Potato family | Subshrub, Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Solanum carolinense | Carolina horsenettle | Potato family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Solanum carolinense var. carolinense | Carolina horsenettle | Potato family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Solanum douglasii | greenspot nightshade | Potato family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Solanum pseudogracile | glowing nightshade | Potato family | Forb/herb | LA(Jefferson, Orleans) | ||
| Solanum ptycanthum | West Indian nightshade | Potato family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Solidago | goldenrod | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Solidago altissima | Canada goldenrod | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Solidago rugosa | wrinkleleaf goldenrod | Aster family | Forb/herb | LA(Orleans) | ||
| Solidago rugosa ssp. rugosa | wrinkleleaf goldenrod | Aster family | Forb/herb | LA(Orleans) | ||
| Solidago rugosa ssp. rugosa var. rugosa | wrinkleleaf goldenrod | Aster family | Forb/herb | LA(Orleans) | ||
| Solidago sempervirens | seaside goldenrod | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Solidago sempervirens var. mexicana | seaside goldenrod | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Solidago stricta | wand goldenrod | Aster family | Forb/herb | LA(Orleans) | ||
| Sparganium | bur-reed | Bur-reed family | LA(Lafourche, Terrebonne) | |||
| Sparganium americanum | American bur-reed | Bur-reed family | Forb/herb | LA(Lafourche, Terrebonne) | ||
| Spartina | cordgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Spartina alterniflora | smooth cordgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Spartina cynosuroides | big cordgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Spartina patens | saltmeadow cordgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Spartina spartinae | gulf cordgrass | Grass family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Spergularia | sandspurry | Pink family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Spergularia salina | salt sandspurry | Pink family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Spermacoce | false buttonweed | Madder family | LA(Terrebonne) | |||
| Spermacoce glabra | smooth false buttonweed | Madder family | Subshrub, Forb/herb | LA(Terrebonne) | ||
| Spermolepis | scaleseed | Carrot family | LA(Jefferson, Orleans) | |||
| Spermolepis echinata | bristly scaleseed | Carrot family | Forb/herb | LA(Jefferson, Orleans) | ||
| Sphenopholis | wedgescale | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sphenopholis filiformis | longleaf wedgescale | Grass family | Graminoid | LA(Orleans) | ||
| Sphenopholis intermedia | slender wedgescale | Grass family | Graminoid | LA(Orleans, Terrebonne) | ||
| Sphenopholis obtusata | prairie wedgescale | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Sphenopholis pensylvanica | swamp wedgescale | Grass family | Graminoid | LA(Jefferson) | ||
| Spiraea | spirea | Rose family | LA(Jefferson, St. Charles) | |||
| Spiranthes | lady's tresses | Orchid family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Spiranthes cernua | nodding lady's tresses | Orchid family | Forb/herb | LA(Jefferson) | ||
| Spiranthes lacera | northern slender lady's tresses | Orchid family | Forb/herb | LA(St. Charles) | ||
| Spiranthes lacera var. gracilis | northern slender lady's tresses | Orchid family | Forb/herb | LA(St. Charles) | ||
| Spiranthes odorata | marsh lady's tresses | Orchid family | Forb/herb | LA(Jefferson, Orleans, Terrebonne) | ||
| Spiranthes praecox | greenvein lady's tresses | Orchid family | Forb/herb | LA(Jefferson, St. Bernard) | ||
| Spiranthes vernalis | spring lady's tresses | Orchid family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Spirodela | duckmeat | Duckweed family | LA(Jefferson, Lafourche, Orleans, St. Charles) | |||
| Spirodela polyrrhiza | common duckmeat | Duckweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Sporobolus | dropseed | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Sporobolus cryptandrus | sand dropseed | Grass family | Graminoid | LA(St. Charles) | ||
| Sporobolus vaginiflorus | poverty dropseed | Grass family | Graminoid | LA(Orleans) | ||
| Sporobolus vaginiflorus var. vaginiflorus | poverty dropseed | Grass family | Graminoid | LA(Orleans) | ||
| Sporobolus virginicus | seashore dropseed | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Stachys | hedgenettle | Mint family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Stachys crenata | mousesear | Mint family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Stachys floridana | Florida hedgenettle | Mint family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Stachys tenuifolia | smooth hedgenettle | Mint family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Steinchisma | gaping grass | Grass family | LA(Orleans, St. Charles, Terrebonne) | |||
| Steinchisma hians | gaping grass | Grass family | Graminoid | LA(Orleans, St. Charles, Terrebonne) | ||
| Stellaria | starwort | Pink family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Stellaria prostrata | prostrate starwort | Pink family | Forb/herb | LA(Jefferson, Lafourche, Orleans, Terrebonne) | ||
| Stenotaphrum | St. Augustine grass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Stenotaphrum secundatum | St. Augustine grass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Strophostyles | fuzzybean | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Strophostyles helvola | amberique-bean | Pea family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Strophostyles leiosperma | slickseed fuzzybean | Pea family | Vine, Forb/herb | LA(Jefferson, Terrebonne) | ||
| Strophostyles umbellata | pink fuzzybean | Pea family | Vine, Forb/herb | LA(Terrebonne) | ||
| Stylodon | stylodon | Verbena family | LA(Orleans) | |||
| Stylodon carneus | Carolina false vervain | Verbena family | Forb/herb | LA(Orleans) | ||
| Styphnolobium | necklacepod | Pea family | LA(Jefferson, Orleans) | |||
| Styphnolobium affine | Eve's necklacepod | Pea family | Shrub, Tree | LA(Jefferson, Orleans) | ||
| Styrax | snowbell | Storax family | LA(Terrebonne) | |||
| Styrax americanus | American snowbell | Storax family | Tree, Shrub | LA(Terrebonne) | ||
| Suaeda | seepweed | Goosefoot family | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | |||
| Suaeda linearis | annual seepweed | Goosefoot family | Subshrub, Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Symphyotrichum | aster | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Symphyotrichum divaricatum | southern annual saltmarsh aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Symphyotrichum dumosum | rice button aster | Aster family | Forb/herb | LA(St. Charles) | ||
| Symphyotrichum elliottii | Marsh American-Aster | Aster family | Forb/herb, Subshrub | LA(Jefferson, Lafourche) | ||
| Symphyotrichum lanceolatum | white panicle aster | Aster family | Forb/herb | LA(Jefferson, St. Bernard) | ||
| Symphyotrichum lanceolatum ssp. lanceolatum | white panicle aster | Aster family | Forb/herb | LA(Jefferson, St. Bernard) | ||
| Symphyotrichum lateriflorum | calico aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Symphyotrichum lateriflorum var. lateriflorum | calico aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Symphyotrichum ontarionis | bottomland aster | Aster family | Forb/herb | LA(Terrebonne) | ||
| Symphyotrichum pilosum | hairy white oldfield aster | Aster family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Symphyotrichum pilosum var. pilosum | hairy white oldfield aster | Aster family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Symphyotrichum praealtum | willowleaf aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Symphyotrichum praealtum var. praealtum | willowleaf aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Symphyotrichum puniceum | purplestem aster | Aster family | Forb/herb, Subshrub | LA(Terrebonne) | ||
| Symphyotrichum puniceum var. scabricaule | purplestem aster | Aster family | Forb/herb, Subshrub | LA(Terrebonne) | ||
| Symphyotrichum racemosum | smooth white oldfield aster | Aster family | Forb/herb | LA(Terrebonne) | ||
| Symphyotrichum squamatum | southeastern annual saltmarsh aster | Aster family | Forb/herb | LA(Orleans) | ||
| Symphyotrichum subulatum | eastern annual saltmarsh aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Symphyotrichum tenuifolium | perennial saltmarsh aster | Aster family | Forb/herb | LA(Jefferson, Lafourche, St. Bernard, Terrebonne) | ||
| Symphyotrichum undulatum | wavyleaf aster | Aster family | Forb/herb | LA(Orleans) | ||
| Taraxacum | dandelion | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Taraxacum officinale | common dandelion | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Taxodium | bald cypress | Cypress family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Taxodium distichum | bald cypress | Cypress family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Teucrium | germander | Mint family | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | |||
| Teucrium canadense | Canada germander | Mint family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Teucrium canadense var. canadense | Canada germander | Mint family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Thalassia | thalassia | Tape-grass family | LA(St. Bernard) | |||
| Thalassia testudinum | turtlegrass | Tape-grass family | Forb/herb | LA(St. Bernard) | ||
| Thalia | alligator-flag | Prayer-Plant family | LA(Orleans) | |||
| Thalia geniculata | bent alligator-flag | Prayer-Plant family | Forb/herb | LA(Orleans) | ||
| Thalictrum | meadow-rue | Buttercup family | LA(Jefferson) | |||
| Thalictrum dasycarpum | purple meadow-rue | Buttercup family | Forb/herb | LA(Jefferson) | ||
| Thelypteris | maiden fern | Marsh Fern family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Thelypteris dentata | downy maiden fern | Marsh Fern family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Thelypteris hispidula | roughhairy maiden fern | Marsh Fern family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Thelypteris hispidula var. versicolor | roughhairy maiden fern | Marsh Fern family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Thelypteris kunthii | Kunth's maiden fern | Marsh Fern family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Thelypteris palustris | eastern marsh fern | Marsh Fern family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Thelypteris palustris var. pubescens | eastern marsh fern | Marsh Fern family | Forb/herb | LA(Jefferson, Lafourche, St. Charles, Terrebonne) | ||
| Tillandsia | airplant | Bromeliad family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | |||
| Tillandsia usneoides | Spanish moss | Bromeliad family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Tithonia | tithonia | Aster family | LA(Orleans) | |||
| Toxicodendron | poison oak | Sumac family | LA(Jefferson, Orleans, St. Charles, Terrebonne) | |||
| Toxicodendron radicans | eastern poison ivy | Sumac family | Shrub, Subshrub, Vine | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Trachelospermum | trachelospermum | Dogbane family | LA(Orleans, Terrebonne) | |||
| Trachelospermum difforme | climbing dogbane | Dogbane family | Vine | LA(Orleans) | ||
| Tradescantia | spiderwort | Spiderwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Tradescantia hirsutiflora | hairyflower spiderwort | Spiderwort family | Forb/herb | LA(Jefferson, Orleans) | ||
| Tradescantia occidentalis | prairie spiderwort | Spiderwort family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, Terrebonne) | ||
| Tradescantia ohiensis | bluejacket | Spiderwort family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Tradescantia pallida | purple queen | Spiderwort family | Forb/herb | LA(Jefferson, Orleans) | ||
| Tradescantia paludosa | confederate spiderwort | Spiderwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Trepocarpus | trepocarpus | Carrot family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Trepocarpus aethusae | whitenymph | Carrot family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Triadenum | marsh St. Johnswort | Mangosteen family | LA(Jefferson, Lafourche, Orleans) | |||
| Triadenum walteri | greater marsh St. Johnswort | Mangosteen family | Forb/herb | LA(Jefferson, Lafourche, Orleans) | ||
| Trianthema | trianthema | Fig-marigold family | LA(Jefferson, Orleans, St. Charles) | |||
| Trianthema portulacastrum | desert horsepurslane | Fig-marigold family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Trichostema | bluecurls | Mint family | LA(Lafourche) | |||
| Trichostema dichotomum | forked bluecurls | Mint family | Forb/herb | LA(Lafourche) | ||
| Tridens | tridens | Grass family | LA(Jefferson, St. Charles) | |||
| Tridens flavus | purpletop tridens | Grass family | Graminoid | LA(St. Charles) | ||
| Tridens flavus var. flavus | purpletop tridens | Grass family | Graminoid | LA(St. Charles) | ||
| Tridens strictus | longspike tridens | Grass family | Graminoid | LA(Jefferson) | ||
| Trifolium | clover | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Trifolium carolinianum | Carolina clover | Pea family | Forb/herb | LA(Terrebonne) | ||
| Trifolium reflexum | buffalo clover | Pea family | Forb/herb | LA(Orleans) | ||
| Triglochin | arrowgrass | Arrow-grass family | LA(Lafourche, Terrebonne) | |||
| Triglochin striata | three-rib arrowgrass | Arrow-grass family | Graminoid | LA(Lafourche, Terrebonne) | ||
| Triodanis | Venus' looking-glass | Bellflower family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Triodanis biflora | small Venus' looking-glass | Bellflower family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Triodanis perfoliata | clasping Venus' looking-glass | Bellflower family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Triplasis | sandgrass | Grass family | LA(Jefferson, St. Bernard, Terrebonne) | |||
| Triplasis purpurea | purple sandgrass | Grass family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Tripsacum | gamagrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Tripsacum dactyloides | eastern gamagrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Trisetum | oatgrass | Grass family | LA(Jefferson) | |||
| Trisetum interruptum | prairie false oat | Grass family | Graminoid | LA(Jefferson) | ||
| Typha | cattail | Cat-tail family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Typha angustifolia | narrowleaf cattail | Cat-tail family | Forb/herb | LA(Jefferson, Orleans, St. Charles) | ||
| Typha domingensis | southern cattail | Cat-tail family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Typha latifolia | broadleaf cattail | Cat-tail family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ulmus | elm | Elm family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Ulmus alata | winged elm | Elm family | Tree | LA(Orleans, Terrebonne) | ||
| Ulmus americana | American elm | Elm family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Ulmus crassifolia | cedar elm | Elm family | Tree | LA(Orleans) | ||
| Ulmus rubra | slippery elm | Elm family | Tree | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Uniola | seaoats | Grass family | LA(Jefferson, St. Bernard, Terrebonne) | |||
| Uniola paniculata | seaoats | Grass family | Graminoid | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Urochloa | signalgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Urochloa fusca | browntop signalgrass | Grass family | Graminoid | LA(Lafourche, Terrebonne) | ||
| Urochloa platyphylla | broadleaf signalgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Urtica | nettle | Nettle family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Urtica chamaedryoides | heartleaf nettle | Nettle family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Utricularia | bladderwort | Bladderwort family | LA(Jefferson, Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Utricularia foliosa | leafy bladderwort | Bladderwort family | Forb/herb | LA(Lafourche, St. Charles, Terrebonne) | ||
| Utricularia gibba | humped bladderwort | Bladderwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Utricularia inflata | swollen bladderwort | Bladderwort family | Forb/herb | LA(St. Charles) | ||
| Utricularia macrorhiza | common bladderwort | Bladderwort family | Forb/herb | LA(St. Charles) | ||
| Uvularia | bellwort | Lily family | LA(Orleans) | |||
| Uvularia grandiflora | largeflower bellwort | Lily family | Forb/herb | LA(Orleans) | ||
| Vachellia | acacia | LA(Jefferson, Orleans, St. Charles) | ||||
| Vachellia farnesiana | sweet acacia | Shrub, Tree | LA(Jefferson, Orleans, St. Charles) | |||
| Valerianella | cornsalad | Valerian family | LA(Lafourche, Orleans, St. Bernard, St. Charles) | |||
| Valerianella radiata | beaked cornsalad | Valerian family | Forb/herb | LA(Lafourche, Orleans, St. Bernard, St. Charles) | ||
| Vallisneria | eelgrass | Tape-grass family | LA(Orleans, Terrebonne) | |||
| Vallisneria americana | American eelgrass | Tape-grass family | Forb/herb | LA(Orleans, Terrebonne) | ||
| Verbena | vervain | Verbena family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Verbena bracteata | bigbract verbena | Verbena family | Forb/herb | LA(Orleans) | ||
| Verbena halei | Texas vervain | Verbena family | Subshrub, Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Verbena hastata | swamp verbena | Verbena family | Forb/herb | LA(Orleans) | ||
| Verbena hastata var. hastata | swamp verbena | Verbena family | Forb/herb | LA(Orleans) | ||
| Verbena scabra | sandpaper vervain | Verbena family | Subshrub, Forb/herb | LA(Jefferson, St. Bernard, Terrebonne) | ||
| Verbena urticifolia | white vervain | Verbena family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Verbena urticifolia var. urticifolia | white vervain | Verbena family | Forb/herb | LA(Jefferson, Orleans, St. Charles, Terrebonne) | ||
| Verbena xutha | Gulf vervain | Verbena family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Verbesina | crownbeard | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Verbesina virginica | white crownbeard | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Verbesina virginica var. virginica | white crownbeard | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Verbesina walteri | Carolina crownbeard | Aster family | Forb/herb | LA(St. Charles) | ||
| Vernonia | ironweed | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Vernonia gigantea | giant ironweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Vernonia gigantea ssp. gigantea | giant ironweed | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Vernonia texana | Texas ironweed | Aster family | Forb/herb | LA(Orleans) | ||
| Veronica | speedwell | Figwort family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Veronica peregrina | neckweed | Figwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Veronica peregrina ssp. peregrina | neckweed | Figwort family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Vicia | vetch | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Vicia ludoviciana | Louisiana vetch | Pea family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Vicia ludoviciana ssp. leavenworthii | Leavenworth's vetch | Pea family | Forb/herb, Vine | LA(Orleans) | ||
| Vicia ludoviciana ssp. ludoviciana | Louisiana vetch | Pea family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Vigna | cowpea | Pea family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Vigna luteola | hairypod cowpea | Pea family | Vine, Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Viola affinis | sand violet | Violet family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Viola pedata | birdfoot violet | Violet family | Forb/herb | LA(Lafourche) | ||
| Viola septemloba | southern coastal violet | Violet family | Forb/herb | LA(Jefferson) | ||
| Viola sororia | common blue violet | Violet family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Charles) | ||
| Viola walteri | prostrate blue violet | Violet family | Forb/herb | LA(St. Charles) | ||
| Vitis | grape | Grape family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Vitis aestivalis | summer grape | Grape family | Vine | LA(Jefferson, St. Bernard, St. Charles) | ||
| Vitis aestivalis var. aestivalis | summer grape | Grape family | Vine | LA(Jefferson, St. Bernard, St. Charles) | ||
| Vitis cinerea | graybark grape | Grape family | Vine | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Vitis labrusca | fox grape | Grape family | Vine | LA(Lafourche, Orleans) | ||
| Vitis mustangensis | mustang grape | Grape family | Vine | LA(Lafourche, Terrebonne) | ||
| Vitis rotundifolia | muscadine | Grape family | Vine | LA(Orleans, St. Charles, Terrebonne) | ||
| Vitis rotundifolia var. rotundifolia | muscadine | Grape family | Vine | LA(Orleans, St. Charles, Terrebonne) | ||
| Vitis vulpina | frost grape | Grape family | Vine | LA(Orleans, St. Charles) | ||
| Vulpia | fescue | Grass family | LA(Jefferson) | |||
| Vulpia octoflora | sixweeks fescue | Grass family | Graminoid | LA(Jefferson) | ||
| Wisteria | wisteria | Pea family | LA(St. Charles, Terrebonne) | |||
| Wisteria frutescens | American wisteria | Pea family | Vine | LA(Terrebonne) | ||
| Wolffia | watermeal | Duckweed family | LA(Lafourche, Orleans, St. Charles, Terrebonne) | |||
| Wolffia brasiliensis | Brazilian watermeal | Duckweed family | Forb/herb | LA(Lafourche, St. Charles) | ||
| Wolffia columbiana | Columbian watermeal | Duckweed family | Forb/herb | LA(Lafourche, Orleans, St. Charles, Terrebonne) | ||
| Wolffiella | bogmat | Duckweed family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Wolffiella gladiata | Florida mudmidget | Duckweed family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Wolffiella lingulata | tongueshape bogmat | Duckweed family | Forb/herb | LA(St. Bernard) | ||
| Wolffiella oblonga | saber bogmat | Duckweed family | Forb/herb | LA(Lafourche, Orleans, St. Charles) | ||
| Woodwardia | chainfern | Chain Fern family | LA(Jefferson, Lafourche, Orleans) | |||
| Woodwardia areolata | netted chainfern | Chain Fern family | Forb/herb | LA(Jefferson, Lafourche, Orleans) | ||
| Woodwardia virginica | Virginia chainfern | Chain Fern family | Forb/herb | LA(Lafourche, Orleans) | ||
| Xanthium | cocklebur | Aster family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Xanthium strumarium | rough cocklebur | Aster family | Forb/herb | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | ||
| Xyris | yelloweyed grass | Yellow-eyed Grass family | LA(Lafourche) | |||
| Xyris difformis | bog yelloweyed grass | Yellow-eyed Grass family | Forb/herb | LA(Lafourche) | ||
| Xyris difformis var. curtissii | Curtiss' yelloweyed grass | Yellow-eyed Grass family | Forb/herb | LA(Lafourche) | ||
| Xyris difformis var. difformis | bog yelloweyed grass | Yellow-eyed Grass family | Forb/herb | LA(Lafourche) | ||
| Xyris laxifolia | laxleaf yelloweyed grass | Yellow-eyed Grass family | Forb/herb | LA(Lafourche) | ||
| Xyris laxifolia var. iridifolia | irisleaf yelloweyed grass | Yellow-eyed Grass family | Forb/herb | LA(Lafourche) | ||
| Yucca | yucca | Century-plant family | LA(Jefferson, Terrebonne) | |||
| Yucca aloifolia | aloe yucca | Century-plant family | Tree, Shrub | LA(Jefferson, Terrebonne) | ||
| Zannichellia | horned pondweed | Horned pondweed family | LA(Jefferson, Orleans, St. Bernard, St. Charles) | |||
| Zannichellia palustris | horned pondweed | Horned pondweed family | Forb/herb | LA(Jefferson, Orleans, St. Bernard, St. Charles) | ||
| Zanthoxylum | pricklyash | Rue family | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | |||
| Zanthoxylum clava-herculis | Hercules' club | Rue family | Tree, Shrub | LA(Jefferson, Lafourche, Orleans, St. Bernard, Terrebonne) | ||
| Zephyranthes | zephyrlily | Lily family | LA(Jefferson, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Zephyranthes grandiflora | rosepink zephyrlily | Lily family | Forb/herb | LA(Orleans) | ||
| Zephyranthes pulchella | showy zephyrlily | Lily family | Forb/herb | LA(St. Bernard, St. Charles) | ||
| Zephyranthes treatiae | zephyrlily | Lily family | Forb/herb | LA(St. Charles) | ||
| Zizania | wildrice | Grass family | LA(Lafourche, St. Charles, Terrebonne) | |||
| Zizania aquatica | annual wildrice | Grass family | Graminoid | LA(Lafourche, St. Charles, Terrebonne) | ||
| Zizania aquatica var. aquatica | annual wildrice | Grass family | Graminoid | LA(Lafourche, St. Charles, Terrebonne) | ||
| Zizaniopsis | cutgrass | Grass family | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) | |||
| Zizaniopsis miliacea | giant cutgrass | Grass family | Graminoid | LA(Jefferson, Lafourche, Orleans, St. Bernard, St. Charles, Terrebonne) |
