| Scolochloa arundinacea (P. Beauv.) Mert. & Koch, 1823 |
| Scolochloa donax (L.) Gaudin, 1828 |
| Scoparia Hitchc. & Chase, 1910 |
| Secale L., 1753 |
| Secale cereale L., 1753 |
| Secale turkestanicum Bensin, 1933 |
| Semeiostachys Drobow, 1941 |
| 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 |