| Santia monspeliensis (L.) Parl., 1845 |
| Sarga Ewart & White, 1911 |
| Sarga trichoclada (Rupr. ex Hack.) Spangler, 2003 |
| Saugetia Hitchc. & Chase, 1917 |
| Savastana Schrank, 1789 |
| Schaffnera Benth., 1882 |
| Schaffnera gracilis Benth., 1882 |
| Schaffnerella Nash, 1912 |
| Schaffnerella gracilis (Benth.) Nash, 1912 |
| Schedonnardus Steud., 1854 |
| Schedonnardus paniculatus (Nutt.) Branner & Coville, 1891 |
| Schedonnardus texanus Steud., 1854 |
| Schedonorus P. Beauv., 1812 |
| Schedonorus arundinaceus (Schreb.) Dumort., 1824 |
| Schedonorus inermis (Leyss.) P. Beauv., 1812 |
| Schedonorus sterilis (L.) Fr., 1843 |
| Schedonorus tectorum (L.) Fr., 1843 |
| Schedonorus tenellus (Willd.) P. Beauv., 1812 |
| Schedonorus unioloides (Kunth) Roem. & Schult., 1817 |
| Schellingia Steud., 1850 |