| 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 |
| Sesleriinae Parl., 1845 |
| Setaria P. Beauv., 1812 |
| Setaria (Ixophorus) (Schltdl.) R.A.W. Herrm., 1909 |
| Setaria adhaerens (Forssk.) Chiov., 1919 |
| Setaria adhaerens subsp. verticillata (L.) Belo-Corr., 1989 |
| Setaria adhaerens var. vertillata (L.) Belo-Corr., 1990 |
| Setaria affinis Schult., 1824 |