| Panicum sanguinale var. vulgare (Schrad.) Döll, 1843 |
| Panicum scaberrimum Lag., 1816 |
| Panicum scandens (Schrad.) Trin., 1826 |
| Panicum scandens var. grandiflorum Döll, 1877 |
| Panicum scandens var. longiseta Döll, 1877 |
| Panicum scandens var. vulgare Döll, 1877 |
| Panicum scariosum Trin. ex Steud., 1841 |
| Panicum schaffneri (E. Fourn.) Kuntze, 1898 |
| Panicum scheelei Steud., 1853 |
| Panicum schiffneri Hack., 1906 |
| Panicum schlechtendalii E. Fourn., 1886 |
| Panicum schlechtendalii var. monstrosum E. Fourn., 1886 |
| Panicum schmitzii Hack., 1902 |
| Panicum schultesii Steud., 1841 |
| Panicum sciaphilum Rupr. ex E. Fourn., 1886 |
| Panicum scoparioides Ashe, 1898 |
| Panicum scoparium Lam., 1798 |
| Panicum scoparium var. angustifolium Vasey, 1889 |
| Panicum scoparium var. pauciflorum Scribn., 1894 |
| Panicum scribnerianum Nash, 1895 |