| Sitanion elymoides Raf., 1819 |
| Sitanion glabrum J.G. Sm., 1899 |
| Sitanion hystrix (Nutt.) J.G. Sm., 1899 |
| Sitanion insulare J.G. Sm., 1899 |
| Sitanion jubatum J.G. Sm., 1899 |
| Sitanion latifolium Piper, 1899 |
| Sitanion longifolium J.G. Sm., 1899 |
| Sitanion marginatum Scribn. & Merr., 1902 |
| Sitanion minus J.G. Sm., 1899 |
| Sitanion molle J.G. Sm., 1899 |
| Sitanion montanum J.G. Sm., 1899 |
| Sitanion pubiflorum J.G. Sm., 1899 |
| Sitanion rigidum J.G. Sm., 1899 |
| Sitanion strigosum J.G. Sm., 1899 |
| Sitanion velutinum Piper, 1903 |
| Sitopsis (Jaub. & Spach) Love, 1982 |
| Sitospelos Adans., 1763 |
| Soderstromia C.V. Morton, 1966 |
| Soderstromia mexicana (Scribn.) C.V. Morton, 1966 |
| Sohnsia Airy Shaw, 1965 |