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| scientific name | common name(s) | image gallery |
| Callicarpa americana | American beautyberry French mulberry | |
| Carex amphibola | Creek Sedge Eastern narrowleaf sedge | |
| 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 | |
| Carex emoryi | Emory Sedge Emory's sedge | |
| Carex frankii | Frank's sedge | |
| Canna glauca | Water Canna Louisiana Canna Maraca amarilla | |
| Carya illinoinensis | Pecan | |
| Castilleja indivisa | Entireleaf indian paintbrush Texas paintbrush Indian paintbrush Scarlet paintbrush Entire-leaf indian-paintbrush | |
| 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 | |
| Carex planostachys | Cedar sedge | |
| Castilleja purpurea | Prairie paintbrush Downy Indian paintbrush Purple paintbrush Lemon paintbrush Purple painted cup | |
| Castilleja purpurea var. lindheimeri | Lindheimer's paintbrush Lindheimer's prairie paintbrush Lindheimer's Indian paintbrush Prairie Paintbrush | |
| Campsis radicans | Trumpet creeper Trumpet vine Common trumpet creeper Cow vine | |
| Carex retroflexa | Reflexed sedge | |
| Camassia scilloides | Atlantic camas Wild hyacinth | |
| Carex texensis | Texas sedge | |
| 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 | |
| Cercis canadensis | Eastern redbud 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 | |
| Centaurium texense | Lady Bird's centaury | |
| Cheilanthes alabamensis | Alabama lipfern | |
| Chaetopappa asteroides | Arkansas leastdaisy Least daisy | |
| Chamaesaracha coniodes | False Nightshade Gray five eyes Ground Saracha Prostrate Ground-cherry | |
| Chamaecrista fasciculata var. fasciculata | Partridge pea Showy Partridge-pea Beeflower | |
| Chasmanthium latifolium | Inland sea oats Indian wood oats Wild oats River oats Flathead oats Upland Oats Upland Sea Oats | |
| Chrysactinia mexicana | Damianita | |
| Chaptalia nutans | Heal and draw Lechuguilla Silverpuff | |
| Chaerophyllum tainturieri var. tainturieri | Hairyfruit chervil Hairy-fruit chervil Wild chervil Chervil | |
| Chaptalia texana | Silverpuff Nodding lettuce Silver puff | |
| Cheilanthes tomentosa | Woolly lipfern | |
| Chloris verticillata | Tumble windmill grass Windmillgrass | |
| Citharexylum berlandieri | Berlandier's fiddlewood Berlandier fiddlewood Fiddlewood | |
| Cirsium texanum | Texas thistle | |
| Cissus trifoliata | Cow-itch vine Sorrelvine Grape ivy Arizona grape ivy Possum grape | |
| 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 | |
| Clematis pitcheri | Purple clematis Purple leatherflower Leatherflower Bluebill | |
| Clematis texensis | Scarlet clematis Scarlet leatherflower Texas clematis | |
| Cocculus carolinus | Carolina snailseed Carolina coralbead Carolina moonseed Red berried moonseed Carolina red berried moonseed | |
| Conyza canadensis var. glabrata | Canadian horseweed Horseweed | |
| Conoclinium coelestinum | Blue mistflower | |
| Corydalis curvisiliqua | Curvepod Curvepod fumewort Golden Smoke Scrambled Eggs | |
| Coelorachis cylindrica | Cylinder jointtail grass Carolina Joint-tail | |
| Cornus drummondii | Roughleaf dogwood Drummond's dogwood Rough-leaf dogwood | |
| Cooperia drummondii | Evening rain lily Evening star rain lily | |
| Convolvulus equitans | Bindweed Texas bindweed | |
| Commelina erecta | Whitemouth dayflower Widow's tears Day flower White-mouth dayflower | |
| Commelina erecta var. angustifolia | Narrow-leaf Dayflower Whitemouth dayflower | |
| Commelina erecta var. erecta | Day Flower Whitemouth dayflower | |
| Conoclinium greggii | Gregg's mistflower Palmleaf thoroughwort Palm-leaf mistflower Palm-leaf thoroughwort Purple palmleaf mistflower Purple palmleaf eupatorium | |
| Condalia hookeri | Bluewood condalia Brasil Brazilwood Brazilian bluewood | |
| Coreopsis lanceolata | Lanceleaf coreopsis Lanceleaf tickseed Lance-leaved coreopsis Sand coreopsis | |
| 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 | |
| Colubrina texensis | Hog-plum Texan hogplum Texas colubrina Texas snakewood | |
| Coreopsis tinctoria | Plains coreopsis Golden tickseed Goldenwave Calliopsis | |
| Coreopsis tinctoria var. tinctoria | Golden tickseed Golden-wave | |
| Croton alabamensis var. texensis | Texabama croton Texas Alabama croton | |
| Cryptotaenia canadensis | Canadian honewort Wild Chervil | |
| 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 | |
| Cyperus articulatus | Jointed flatsedge Chintul | |
| Cynanchum barbigerum | Bearded swallow-wort Cynanchum Thicket Threadvine | |
| Cylindropuntia leptocaulis | Christmas cactus Christmas cholla Desert Christmas cactus Pencil cactus Tasajillo | |
| Cymopterus macrorhizus | Bigroot springparsley Big-Root Cymopterus | |
| Cyperus ochraceus | Pond flatsedge Yellow Sedge | |
| Cyperus odoratus | Fragrant flatsedge Fragrant Sedge | |
| Cyperus pseudovegetus | Marsh flatsedge Marsh Flat Sedge | |
| Dalea aurea | Golden dalea Golden prairie clover | |
| Dalea bicolor var. argyrea | Silver prairie clover Silver dalea Silver bush dalea | |
| Dalea candida var. candida | White prairie clover White prairie-clover | |
| Dalea compacta var. pubescens | Compact prairie clover | |
| Dalea frutescens | Black dalea Black prairie clover | |
| Dalea greggii | Gregg dalea Gregg's prairie clover Trailing indigo bush Indigo bush | |
| Dalea multiflora | Roundhead prairie clover White prairie clover Round headed dalea Round headed clover | |
| Daucus pusillus | American wild carrot Rattlesnake-Weed Wild Carrot | |
| Dalea purpurea var. purpurea | Purple prairie clover Violet prairie clover | |
| Dasylirion texanum | Texas sotol Sotol | |
| Dasylirion wheeleri | Common sotol Sotol Desert Spoon Desert candle | |
| Datura wrightii | Sacred thorn-apple Jimsonweed Thorn apple Datura Angel Trumpet Sacred datura | |
| Delphinium carolinianum ssp. virescens | Carolina larkspur Prairie larkspur Plains larkspur | |
| Desmanthus illinoensis | Illinois bundleflower Bundleflower Prairie bundle flower Prickleweed Illinois Desmanthus Prairie mimosa | |
| scientific name | common name(s) | image gallery |