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| scientific name | common name(s) | image gallery |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acacia rigidula | Blackbrush acacia Blackbrush Catclaw Chaparro prieto Gavia | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Aesculus pavia var. flavescens | Texas yellow buckeye Yellow woolly buckeye Pale buckeye Plateau yellow buckeye | |
| Aesculus pavia var. pavia | Scarlet buckeye Red buckeye Southern buckeye Firecracker plant | |
| Agave americana | American century plant Century plant | |
| Agave havardiana | Havard's century plant Havard agave | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agave univittata | Maguey mezortillo Thorncrest century plant | |
| Allium canadense | Meadow garlic Wild garlic Wild onion | |
| Allium drummondii | Drummond's onion Wild Garlic Drummond wild onion | |
| Aloysia gratissima | Whitebrush Bee-brush White-brush Common bee-brush Beebrush Privet lippia | |
| Allowissadula holosericea | Chisos Mountain false Indianmallow Chisos Mtn. False Indian-mallow Velvet-leaf Mallow | |
| Aloysia macrostachya | Rio Grande beebrush Woolly Bee-brush | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amorpha roemeriana | Roemer's false indigo | |
| Anemone edwardsiana | Edwards Plateau thimbleweed Two-flowered Anemone | |
| Andropogon gerardii | Big bluestem Turkeyfoot | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| Anisacanthus quadrifidus var. wrightii | Flame acanthus Hummingbird bush Wright's desert honeysuckle Wright acanthus Mexican flame Wright's Mexican flame | |
| Aphanostephus riddellii | Lazy Daisy Riddell's dozedaisy | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| Arisaema dracontium | Green dragon Dragonroot Greendragon | |
| Aristida oligantha | Prairie threeawn Oldfield (Prairie) 3-awn Oldfield threeawn | |
| Artemisia palmeri | San Diego sagebrush San Diego sagewort | |
| Arnoglossum plantagineum | Groovestem Indian plaintain Indian plantain Prairie plantain Prairie Indian plantain | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Aristida purpurea var. purpurea | Purple threeawn Red threeawn | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Asclepias incarnata | Swamp milkweed Pink Milkweed | |
| Asclepias oenotheroides | Zizotes milkweed Hierba de Zizotes Longhorn milkweed Side-cluster milkweed Primrose milkweed Lindheimer's milkweed | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Asclepias viridis | Green antelopehorn Green milkweed | |
| Bauhinia lunarioides | Anacacho orchid tree Anacacho bauhinia Orchid tree Texas plume | |
| Bacopa monnieri | Coastal Water-hyssop Herb-of-grace Water hyssop | |
| Baccharis neglecta | False Willow Jara dulce Poverty Weed Roosevelt Weed | |
| Berlandiera betonicifolia | Texas greeneyes Broochflower | |
| Berlandiera lyrata | Chocolate daisy Chocolate flower Lyreleaf greeneyes Green-Eyed lyre leaf | |
| Bignonia capreolata | Crossvine | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua dactyloides | Buffalograss Buffalo grass | |
| Bouchetia erecta | Painted Tongue Paintedtongue | |
| Bothriochloa laguroides ssp. torreyana | Silver Beard Grass Silver beardgrass Silver Bluestem | |
| Bouchea linifolia | Flaxleaf bouchea Groovestem bouchea | |
| Bouteloua rigidiseta | Texas grama | |
| Brickellia cylindracea | Brickell-Bush Brickellbush Gravelbar brickellbush | |
| Buddleja marrubiifolia | Woolly butterflybush Butterfly bush Woolly Butterfly-bush | |
| Capsicum annuum | Chile pequin Chile petin Bird pepper Turkey pepper Cayenne pepper | |
| Capsicum annuum var. glabriusculum | Chile pequin Bird pepper Turkey pepper Cayenne pepper | |
| Calylophus berlandieri | Berlandier's sundrops Square-bud primrose Sundrops | |
| Calylophus berlandieri ssp. pinifolius | Berlandier's sundrops Square-bud primrose Sundrops Square-bud day-primrose | |
| Carex blanda | Eastern woodland sedge Creek sedge Common wood sedge | |
| Carex cherokeensis | Cherokee sedge | |
| Canna flaccida | Bandanna of the Everglades Golden canna | |
| Canna glauca | Water Canna Louisiana Canna Maraca amarilla | |
| Callirhoe involucrata | Winecup Purple poppy mallow | |
| Callirhoe involucrata var. lineariloba | Poppy mallow Purple poppymallow White poppy mallow White winecup Winecup | |
| Callirhoe leiocarpa | Tall poppymallow Annual winecup Tall poppy-mallow | |
| Callirhoe pedata | Finger Poppy-mallow Palmleaf poppymallow Standing Winecup | |
| Carex perdentata | Meadow Sedge Sand sedge | |
| Campsis radicans | Trumpet creeper Trumpet vine Common trumpet creeper Cow vine | |
| Carex texensis | Texas sedge | |
| Cercis canadensis | Eastern redbud Redbud | |
| Cercis canadensis var. mexicana | Mexican redbud | |
| Cercis canadensis var. texensis | Texas redbud | |
| Ceanothus herbaceus | Redroot Prairie redroot Jersey tea Inland Ceanothus Fuzzy Ceanothus | |
| Celtis laevigata | Sugar hackberry Hackberry Sugarberry Texas sugarberry Palo blanco | |
| Celtis laevigata var. reticulata | Netleaf hackberry Netleaf sugar hackberry Sugar Hackberry Texas Sugarberry Palo Blanco Acibuche | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Chamaesaracha coniodes | False Nightshade Gray five eyes Ground Saracha Prostrate Ground-cherry | |
| Chasmanthium latifolium | Inland sea oats Indian wood oats Wild oats River oats Flathead oats Upland Oats Upland Sea Oats | |
| Chilopsis linearis | Desert willow Flowering willow Willow-leaved catalpa Trumpet flower | |
| Chrysactinia mexicana | Damianita | |
| Chaptalia nutans | Heal and draw Lechuguilla Silverpuff | |
| Chaerophyllum tainturieri var. tainturieri | Hairyfruit chervil Hairy-fruit chervil Wild chervil Chervil | |
| Clematis drummondii | Drummond's clematis Old man’s beard Texas virgin’s bower Goat’s beard | |
| Cladium mariscus ssp. jamaicense | Jamaica swamp sawgrass Jamaican Saw-grass Saw-grass | |
| Cleome serrulata | Rocky Mountain beeplant Rocky mountain bee plant Waa Skunk weed | |
| Clematis texensis | Scarlet clematis Scarlet leatherflower Texas clematis | |
| Cocculus carolinus | Carolina snailseed Carolina coralbead Carolina moonseed Red berried moonseed Carolina red berried moonseed | |
| Corydalis curvisiliqua | Curvepod Curvepod fumewort Golden Smoke Scrambled Eggs | |
| Cotinus obovatus | American smoke tree Smoke tree Texas smoke tree Chittamwood | |
| Cooperia pedunculata | Hill Country rain lily Prairie lily Rain lily | |
| Coryphantha sulcata | Nipple Cactus Pineapple cactus | |
| Coreopsis tinctoria | Plains coreopsis Golden tickseed Goldenwave Calliopsis | |
| Cryptotaenia canadensis | Canadian honewort Wild Chervil | |
| Croton capitatus var. lindheimeri | Woolly Croton Lindheimer's hogwort | |
| Croton fruticulosus | Bush croton Encinilla Hierba Loca | |
| Crataegus greggiana | Gregg's hawthorn | |
| Croton monanthogynus | Prairie tea One-seed Croton | |
| Crataegus tracyi | Mountain Hawthorn Tracy Hawthorn Tracy's hawthorn | |
| Crataegus viridis | Green hawthorn Southern thorn | |
| Cynanchum barbigerum | Bearded swallow-wort Cynanchum Thicket Threadvine | |
| Cylindropuntia imbricata var. imbricata | Cane cactus Cholla Teddy-bear cholla Tree cholla Walkingstick cholla | |
| Cylindropuntia leptocaulis | Christmas cactus Christmas cholla Desert Christmas cactus Pencil cactus Tasajillo | |
| scientific name | common name(s) | image gallery |