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| scientific name | common name(s) | image gallery |
| 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 | |
| Calyptocarpus vialis | Straggler daisy Horseherb Hierba del caballo Lawnflower | |
| Cercis canadensis var. mexicana | Mexican redbud | |
| Cercis canadensis var. texensis | Texas redbud | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| 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 | |
| scientific name | common name(s) | image gallery |