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| scientific name | common name(s) | image gallery |
| Abronia ameliae | Amelia's sand verbena Heart’s delight Amelia's sand-verbena Sand verbena | |
| Abutilon fruticosum | Indian mallow Texas Indian mallow | |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| Acalypha phleoides | Shrubby copperleaf Three-seeded mercury | |
| Acacia rigidula | Blackbrush acacia Blackbrush Catclaw Chaparro prieto Gavia | |
| Acacia roemeriana | Roundflower catclaw Round-flower catclaw Roemer acacia Catclaw Roemer’s acacia Catclaw acacia | |
| Acacia schaffneri | Schaffner's wattle Twisted acacia | |
| Adolphia infesta | Junco | |
| Agalinis edwardsiana | Plateau false foxglove Plateau agalinis Plateau gerardia Plateau false-foxglove | |
| Agalinis fasciculata | Beach false foxglove | |
| Agave havardiana | Havard's century plant Havard agave | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agalinis heterophylla | Prairie false foxglove Prairie agalinis Prairie false-foxglove | |
| Agalinis maritima | Saltmarsh false foxglove | |
| Agastache micrantha | White giant hyssop | |
| Aletris aurea | Golden colicroot Colicroot Star grass Yellow colic root | |
| Allium canadense var. fraseri | Fraser meadow garlic Fraser meadow garlic | |
| Allium drummondii | Drummond's onion Wild Garlic Drummond wild onion | |
| Allowissadula holosericea | Chisos Mountain false Indianmallow Chisos Mtn. False Indian-mallow Velvet-leaf Mallow | |
| Ampelopsis arborea | Peppervine | |
| Ambrosia confertiflora | Weakleaf bur ragweed | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amaranthus greggii | Gregg's amaranth | |
| Ambrosia trifida | Great ragweed Giant ragweed | |
| Anemone berlandieri | Tenpetal thimbleweed Ten-petaled anemone Wind-flower | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| Andropogon ternarius | Splitbeard bluestem | |
| Argemone aenea | Golden pricklypoppy | |
| Argemone albiflora ssp. texana | Bluestem pricklypoppy White pricklypoppy | |
| Argemone aurantiaca | Texas pricklypoppy | |
| Aristida lanosa | Woollysheath Threeawn Woolly Three-awn | |
| Aristida longespica | Slimspike threeawn Kearney's three-awn red three-awn slender three-awn | |
| Aristida oligantha | Prairie threeawn Oldfield (Prairie) 3-awn Oldfield threeawn | |
| Arabis petiolaris | Brazos rockcress Rock-cress Brazos rock-cress | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Argemone sanguinea | Red prickly poppy Red pricklypoppy Rose prickly poppy | |
| Asclepias asperula ssp. capricornu | Antelopehorns Antelope horns | |
| Asclepias brachystephana | Bract milkweed | |
| Astragalus crassicarpus | Groundplum milkvetch Ground plum | |
| Asclepias oenotheroides | Zizotes milkweed Hierba de Zizotes Longhorn milkweed Side-cluster milkweed Primrose milkweed Lindheimer's milkweed | |
| Asimina parviflora | Smallflower pawpaw Small-flower pawpaw Dwarf pawpaw | |
| Atriplex matamorensis | Matamoros saltbush | |
| Baccharis bigelovii | Bigelow's false willow | |
| Batis maritima | Seaside saltwort Turtleweed | |
| Bacopa monnieri | Coastal Water-hyssop Herb-of-grace Water hyssop | |
| Baccharis neglecta | False Willow Jara dulce Poverty Weed Roosevelt Weed | |
| Baptisia nuttalliana | Nuttall's wild indigo | |
| Bahia pedata | Bluntscale bahia | |
| Baptisia sphaerocarpa | Bush pea Green wild indigo Yellow wild indigo Yellow wisteria | |
| Berlandiera betonicifolia | Texas greeneyes Broochflower | |
| Berlandiera pumila | Soft greeneyes | |
| Berchemia scandens | Alabama supple-jack Alabama supplejack Rattan-vine | |
| Bifora americana | Prairie bishop Prairie bishop’s-weed | |
| Bidens bigelovii | Bigelow's beggarticks | |
| Bothriochloa alta | Tall beardgrass | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouchetia erecta | Painted Tongue Paintedtongue | |
| Borrichia frutescens | Bushy seaside tansy Bushy seaside-tansy Ox-eye daisy Sea daisy Sea ox-eye | |
| Bouteloua hirsuta | Hairy grama | |
| Bothriochloa laguroides | Silver Bluestem Silver beardgrass | |
| Bothriochloa longipaniculata | Longspike beardgrass Longspike Silver Bluestem | |
| Bouteloua rigidiseta | Texas grama | |
| Bouteloua trifida | Red grama | |
| Brickellia cylindracea | Brickell-Bush Brickellbush Gravelbar brickellbush | |
| Brickellia dentata | Leafy brickellbush | |
| Bromus lanatipes | Woolly brome | |
| Brazoria truncata | Rattlesnake flower | |
| Callicarpa americana | American beautyberry French mulberry | |
| Capsicum annuum var. glabriusculum | Chile pequin Bird pepper Turkey pepper Cayenne pepper | |
| Calylophus berlandieri | Berlandier's sundrops Square-bud primrose Sundrops | |
| Carex cherokeensis | Cherokee sedge | |
| Carex complanata | Hirsute sedge | |
| Castela erecta ssp. texana | Allthorn goatbush Amargoso Goat-bush Texan goatbush | |
| Carex glaucescens | Southern waxy sedge | |
| Castilleja indivisa | Entireleaf indian paintbrush Texas paintbrush Indian paintbrush Scarlet paintbrush Entire-leaf indian-paintbrush | |
| Cakile lanceolata | Coastal searocket | |
| Castilleja lanata | Sierra woolly Indian paintbrush Woolly paintbrush | |
| Carex louisianica | Louisiana sedge | |
| Carex oklahomensis | Oklahoma sedge | |
| Callirhoe pedata | Finger Poppy-mallow Palmleaf poppymallow Standing Winecup | |
| Castilleja purpurea var. purpurea | Purple paintbrush Purple prairie painbrush Prairie paintbrush Downy Indian paintbrush | |
| Carex tenax | Wire sedge | |
| Carex tetrastachya | Britton's sedge | |
| Carex triangularis | Eastern fox sedge | |
| Calyptocarpus vialis | Straggler daisy Horseherb Hierba del caballo Lawnflower | |
| Centaurea americana | American star-thistle Basket-Flower Star thistle Shaving brush American basket-flower | |
| Centaurium beyrichii | Mountain pink Meadow pink Catchfly Quinineweed | |
| Cerastium brachypodum | Short-stalk Chickweed Shortstalk chickweed | |
| Celtis ehrenbergiana | Desert hackberry Spiny hackberry Granjeno Shiny hackberry Huasteco | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Cevallia sinuata | Stinging serpent Stinging cevallia | |
| Cenchrus spinifex | Coastal sandbur Field Sandspur Southern sandbur Spiny burrgrass | |
| Centaurium texense | Lady Bird's centaury | |
| Centrosema virginianum | Butterfly pea Spurred butterfly pea | |
| Chaetopappa asteroides | Arkansas leastdaisy Least daisy | |
| Chloris cucullata | Hooded windmill grass Hooded windmillgrass | |
| Chamaecrista fasciculata | Partridge pea Sleepingplant Sensitive plant | |
| scientific name | common name(s) | image gallery |