| Scirpus nevadensis S. Watson, 1871 |
| Scirpus nigrescens (Nees) Nees, 1834 |
| Scirpus nitens Vahl, 1805 |
| Scirpus nodulosus Roth, 1821 |
| Scirpus obtusifolius (Lam.) Kunth, 1837 |
| Scirpus occidentalis (S. Watson) Chase, 1904 |
| Scirpus occidentalis var. congestus Farw., 1917 |
| Scirpus ochreatus (Nees) Griseb., 1864 |
| Scirpus olneyi A. Gray, 1847 |
| Scirpus orbicephalus Beetle, 1944 |
| Scirpus pachystylus C. Wright, 1871 |
| Scirpus pacificus Britton ex Parish, 1905 |
| Scirpus pallidus (Britton) Fernald, 1906 |
| Scirpus paludosus A. Nelson, 1899 |
| Scirpus paradoxus (Spreng.) Boeckeler, 1870 |
| Scirpus parvulus Roem. & Schult., 1817 |
| Scirpus pendulus Muhl., 1813 |
| Scirpus plantagineus Sw., 1797 |
| Scirpus plicarhachis Griseb., 1866 |
| Scirpus potosiensis C.B. Clarke, 1908 |