| Schizachyrium tenerum Nees, 1829 |
| Schizachyrium tenerum var. cirratum (Hack.) Roberty, 1960 |
| Schizachyrium tenerum var. filiforme (Nees) Roberty, 1960 |
| Schizachyrium tenerum var. scabriglume (Hack.) Roberty, 1960 |
| Schizachyrium triaristatum Nash, 1903 |
| Schizachyrium villosissimum (Kearney) Nash, 1903 |
| Schizachyrium weberbaueri Pilg., 1923 |
| Schizachyrium weberbaueri var. minus Pilg., 1923 |
| Schizopogon Rchb., 1830 |
| Schizopogon decumbens Rchb. ex Steud., 1841 |
| Schleropelta Buckley, 1866 |
| Schleropelta stolonifera Buckley, 1866 |
| Schoenanthus Adans., 1763 |
| Schultesia Spreng., 1815 |
| Schultesia petraea (Sw.) Spreng., 1815 |
| Sciadonardus Steud., 1850 |
| Sclerachne Torr. ex Trin., 1841 |
| Sclerochloa P. Beauv., 1812 |
| Sclerochloa (Dumort.) Dumort., 1827 |
| Sclerochloa rigida (L.) Link, 1821 |