| Crypsis explicata (Link) F. Herm., 1937 |
| Crypsis juncea (P. Beauv.) Steud., 1821 |
| Crypsis macroura Kunth, 1815 |
| Crypsis phalaroides M. Bieb., 1808 |
| Crypsis schoenoides (L.) Lam., 1791 |
| Crypsis setifolia J. Presl, 1830 |
| Crypsis squarrosa Nutt., 1818 |
| Crypsis vaginiflora (Forssk.) Opiz, 1824 |
| Crypsis virginica (L.) Nutt., 1818 |
| Cryptochloa Swallen, 1942 |
| Cryptochloa concinna (Hook. f.) Swallen, 1942 |
| Cryptochloa granulifera Swallen, 1942 |
| Cryptochloa strictiflora (E. Fourn.) Swallen, 1942 |
| Cryptopyrum Heynh., 1846 |
| Cryptopyrum richardsoni Heynh., 1846 |
| Cryptostachys Steud., 1854 |
| Crypturus Link, 1844 |
| Cteniinae P.M. Peterson, Romasch. & Herrera, 2014 |
| Ctenium Panz., 1813 |
| Ctenium glandulosum Scribn. & J.G. Sm., 1896 |