| Suardia Schrank, 1820 |
| Swallenochloa McClure, 1973 |
| Syllepis E. Fourn., 1886 |
| Syllepis polystachya (Sw.) E. Fourn. ex Hack., 1883 |
| Syllepis ruprechtii E. Fourn., 1886 |
| Symbasiandra Steud., 1840 |
| Synaphe Dulac, 1867 |
| Synaphe rigida (L.) Dulac, 1867 |
| Syntherisma Walter, 1788 |
| Syntherisma argillacea Hitchc. & Chase, 1917 |
| Syntherisma argyrostachya (Steud.) Hitchc. & Chase, 1917 |
| Syntherisma badia (Scribn. & Merr.) Chase, 1906 |
| Syntherisma bakeri Nash, 1898 |
| Syntherisma barbata (Willd.) Nash, 1898 |
| Syntherisma ciliare (Retz.) Schrad., 1806 |
| Syntherisma consanguinea (Gaudich.) Skeels, 1913 |
| Syntherisma digitatum (Sw.) Hitchc., 1908 |
| Syntherisma distans Chase, 1913 |
| Syntherisma filiforme (L.) Nash, 1895 |
| Syntherisma fimbriatum (Link) Nash, 1898 |