| Senisetum Honda, 1932 |
| Senites Adans., 1763 |
| Senites capillaris Hitchc., 1913 |
| Senites hartwegii (E. Fourn.) Arthur, 1919 |
| Senites latifolia (E. Fourn.) Hitchc., 1913 |
| Senites latifolia subsp. pringlei (Hack.) Hitchc., 1913 |
| Senites mexicana (Kunth) Hitchc., 1913 |
| Senites pringlei (Scribn.) Hitchc., 1913 |
| Senites smilacifolia (Scribn.) Hitchc., 1913 |
| Senites zeugites (L.) Nash, 1908 |
| Sericrostis Raf., 1825 |
| Sericura Hassk., 1842 |
| Serpentes L.G. Clark, 1989 |
| Serrafalcus Parl., 1840 |
| Serrafalcus mollis (L.) Parl., 1840 |
| Serrafalcus unioloides Samp., 1947 |
| Sesleria Scop., 1760 |
| Sesleriinae Parl., 1845 |
| Setaria P. Beauv., 1812 |
| Setaria (Ixophorus) (Schltdl.) R.A.W. Herrm., 1909 |