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| scientific name | common name(s) | image gallery |
| Bothriochloa saccharoides | Silver bluestem Longspike silver bluestem | |
| Bouvardia ternifolia | Scarlet bouvardia Firecracker bush Trompetilla Clavillo | |
| Buddleja marrubiifolia | Woolly butterflybush Butterfly bush Woolly Butterfly-bush | |
| Buddleja sessiliflora | Rio Grande butterflybush Tepozan | |
| Callicarpa americana | American beautyberry French mulberry | |
| Capsicum annuum | Chile pequin Chile petin Bird pepper Turkey pepper Cayenne pepper | |
| Calylophus berlandieri ssp. pinifolius | Berlandier's sundrops Square-bud primrose Sundrops Square-bud day-primrose | |
| Carpinus caroliniana | American hornbeam Blue beech Musclewood Ironwood | |
| Calliandra conferta | Rio Grande stickpea Fairy duster | |
| Calamovilfa gigantea | Giant sandreed Prairie sandreed | |
| Carya illinoinensis | Pecan | |
| Castilleja indivisa | Entireleaf indian paintbrush Texas paintbrush Indian paintbrush Scarlet paintbrush Entire-leaf indian-paintbrush | |
| Callirhoe involucrata | Winecup Purple poppy mallow | |
| Campsis radicans | Trumpet creeper Trumpet vine Common trumpet creeper Cow vine | |
| Carya texana | Black hickory | |
| Cercis canadensis var. canadensis | Eastern redbud | |
| Cercis canadensis var. mexicana | Mexican redbud | |
| Cercis canadensis var. texensis | Texas redbud | |
| Celtis ehrenbergiana | Desert hackberry Spiny hackberry Granjeno Shiny hackberry Huasteco | |
| 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 | |
| Cercocarpus montanus var. argenteus | Silver mountain mahogany Mountain mahogany True mountain mahogany Silverleaf mountain mahogany | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Chiococca alba | West Indian milkberry David’s milkberry Cahinca Snowberry | |
| Chamaecrista fasciculata | Partridge pea Sleepingplant Sensitive plant | |
| 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 | |
| Chromolaena odorata | Jack in the bush Fragrant boneset Fragrant mistflower Crucita Blue mistflower | |
| Chionanthus virginicus | White fringetree Fringe tree Grancy Graybeard | |
| Chloris virgata | Feather fingergrass Showy chloris | |
| Citharexylum berlandieri | Berlandier's fiddlewood Berlandier fiddlewood Fiddlewood | |
| Clematis crispa | Swamp leatherflower Curly clematis Blue jasmine Curlflower | |
| Clematis drummondii | Drummond's clematis Old man’s beard Texas virgin’s bower Goat’s beard | |
| Clematis pitcheri | Purple clematis Purple leatherflower Leatherflower Bluebill | |
| Cordia boissieri | Mexican olive Anacahuita Texas wild olive Anacahuite | |
| Cocculus carolinus | Carolina snailseed Carolina coralbead Carolina moonseed Red berried moonseed Carolina red berried moonseed | |
| Cocculus diversifolius | Correhuela Snailseed | |
| Cornus florida | Flowering dogwood Virginia dogwood | |
| Condalia hookeri | Bluewood condalia Brasil Brazilwood Brazilian bluewood | |
| Coreopsis lanceolata | Lanceleaf coreopsis Lanceleaf tickseed Lance-leaved coreopsis Sand coreopsis | |
| Colubrina texensis | Hog-plum Texan hogplum Texas colubrina Texas snakewood | |
| Coreopsis tinctoria | Plains coreopsis Golden tickseed Goldenwave Calliopsis | |
| Crataegus marshallii | Parsley hawthorn | |
| Crataegus viridis | Green hawthorn Southern thorn | |
| Cylindropuntia imbricata | Tree cholla Walking stick cholla Cholla | |
| Dalea bicolor var. argyrea | Silver prairie clover Silver dalea Silver bush dalea | |
| Dalea formosa | Feather dalea Featherplume | |
| Digitaria californica | Arizona cottontop California cottontop California crab grass Cottontop | |
| Diospyros texana | Texas persimmon Mexican persimmon Black persimmon Chapote Chapote prieto | |
| Diospyros virginiana | Common persimmon Eastern persimmon | |
| scientific name | common name(s) | image gallery |