| Paspalum sericeum Scheele, 1849 |
| Paspalum serpentinum Hochst. ex Steud., 1855 |
| Paspalum serratum Hitchc. & Chase, 1917 |
| Paspalum setaceum Michx., 1803 |
| Paspalum setaceum var. ciliatifolium (Michx.) Vasey, 1892 |
| Paspalum setaceum var. dispar R. Guzmán, 1982 |
| Paspalum setaceum var. psammophilum (Nash ex Hitchc.) D.J. Banks, 1966 |
| Paspalum setaceum var. pubiflorum Vasey, 1891 |
| Paspalum setaceum var. setaceum Michx., 1803 |
| Paspalum setaceum var. stramineum (Nash) D.J. Banks, 1966 |
| Paspalum sieberianum Steud., 1855 |
| Paspalum simpsonii Nash, 1897 |
| Paspalum sincoranum Mez, 1921 |
| Paspalum soboliferum Chase, 1927 |
| Paspalum sparsum Chase, 1934 |
| Paspalum squamulatum E. Fourn., 1886 |
| Paspalum stellatum Humb. & Bonpl. ex Flüggé, 1810 |
| Paspalum stellatum f. hirsuta Hack., 1911 |
| Paspalum stellatum var. distachyum Nees, 1829 |
| Paspalum stellatum var. monostachyum Nees, 1829 |