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| scientific name | common name(s) | image gallery |
| 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 | Prairie paintbrush Downy Indian paintbrush Purple paintbrush Lemon paintbrush Purple painted cup | |
| Callirhoe scabriuscula | Texas poppymallow | |
| 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 | |
| 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 | |
| Chaetopappa asteroides | Arkansas leastdaisy Least daisy | |
| Chloris cucullata | Hooded windmill grass Hooded windmillgrass | |
| 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 | |
| Chrysactinia mexicana | Damianita | |
| Chaerophyllum tainturieri | Hairyfruit chervil Southern chervil | |
| Chloris verticillata | Tumble windmill grass Windmillgrass | |
| scientific name | common name(s) | image gallery |