| Catapodium rigidum (L.) C.E. Hubb., 1953 |
| Catatherophora Steud., 1829 |
| Cathestecum J. Presl, 1830 |
| Cathestecum annuum Swallen, 1937 |
| Cathestecum brevifolium Swallen, 1937 |
| Cathestecum erectum Vasey & Hack., 1884 |
| Cathestecum multifidum Griffiths, 1912 |
| Cathestecum prostratum J. Presl, 1830 |
| Cathestecum stoloniferum (E. Fourn.) Griffiths, 1912 |
| Cathestecum varium Swallen, 1937 |
| Cenchrinae Dumort., 1829 |
| Cenchropsis Nash, 1903 |
| Cenchropsis myosuroides (Kunth) Nash, 1903 |
| Cenchrus L., 1753 |
| Cenchrus advena (Wipff & Veldkamp) Morrone, 2010 |
| Cenchrus aequiglumis Chiov., 1926 |
| Cenchrus albertsonii Runyon, 1939 |
| Cenchrus alopecuroides J. Presl, 1830 |
| Cenchrus americanus (L.) Morrone, 2010 |
| Cenchrus anjania Buch.-Ham. ex Wall., 1848 |