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| scientific name | common name(s) | image gallery |
| Callirhoe leiocarpa | Tall poppymallow Annual winecup Tall poppy-mallow | |
| Cardamine parviflora var. arenicola | Sand bittercress | |
| Callirhoe pedata | Finger Poppy-mallow Palmleaf poppymallow Standing Winecup | |
| Carex planostachys | Cedar sedge | |
| Castilleja purpurea var. citrina | Lemon paintbrush Yellow paintbrush Yellow prairie paintbrush Citron paintbrush Prairie paintbrush Prairie Indian paintbrush | |
| 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 | |
| Calylophus serrulatus | Yellow sundrops Yellow evening primrose Plains evening primrose | |
| Calystegia sepium | Hedge false bindweed Hedge Bindweed | |
| Carex tetrastachya | Britton's sedge | |
| Carlowrightia torreyana | Torrey's wrightwort | |
| 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 | |
| Cercis canadensis var. texensis | Texas redbud | |
| Celtis ehrenbergiana | Desert hackberry Spiny hackberry Granjeno Shiny hackberry Huasteco | |
| Ceanothus herbaceus | Redroot Prairie redroot Jersey tea Inland Ceanothus Fuzzy Ceanothus | |
| Celtis laevigata var. reticulata | Netleaf hackberry Netleaf sugar hackberry Sugar Hackberry Texas Sugarberry Palo Blanco Acibuche | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Cenchrus spinifex | Coastal sandbur Field Sandspur Southern sandbur Spiny burrgrass | |
| Celtis tenuifolia | Dwarf hackberry Small sugar hackberry | |
| Centaurium texense | Lady Bird's centaury | |
| Chamaesyce angusta | Blackfoot sandmat | |
| Chaetopappa bellidifolia | Whiteray leastdaisy Dwarf white aster | |
| Chamaesaracha coniodes | False Nightshade Gray five eyes Ground Saracha Prostrate Ground-cherry | |
| scientific name | common name(s) | image gallery |