| Ctenium planifolium (J. Presl) Kunth, 1833 |
| Ctenium plumosum (Hitchc.) Swallen, 1939 |
| Ctenopsis De Not., 1847 |
| Ctenopsis (De Not.) F. Herm., 1936 |
| Ctenopsis (De Not.) F. Herm., 1936 |
| Curtopogon P. Beauv., 1812 |
| Curtopogon gracilis Nees ex Trin. & Rupr., 1842 |
| Cyclostachya Reeder & C. Reeder, 1963 |
| Cyclostachya stolonifera (Scribn.) Reeder & C. Reeder, 1963 |
| Cylindropyrum (Jaub.) Á. Löve, 1982 |
| Cymatochloa Schltdl., 1854 |
| Cymatochloa fluitans (Elliott) Schltdl., 1854 |
| Cymatochloa pyramidalis (Nees) Schltdl. ex Döll, 1877 |
| Cymatochloa repens (P.J. Bergius) Schltdl., 1854 |
| Cymbachne Retz., 1791 |
| Cymbachne angustata (J. Presl) Roberty, 1960 |
| Cymbachne fastigiata (Sw.) Roberty, 1960 |
| Cymbanthelia Andersson, 1856 |
| Cymbopogon Spreng., 1815 |
| Cymbopogon (Spreng.) Steud., 1855 |