| Scirpus robustus var. compactus Jeps., 1901 |
| Scirpus robustus var. paludosus (A. Nelson) Fernald, 1900 |
| Scirpus rostellatus Torr., 1836 |
| Scirpus rubiginosus Beetle, 1941 |
| Scirpus rubricosus Fernald, 1945 |
| Scirpus rufescens Boeckeler, 1870 |
| Scirpus saximontanus Fernald, 1901 |
| Scirpus schaffneri (Boeckeler) Kuntze, 1891 |
| Scirpus sellowianus (Kunth) Griseb., 1879 |
| Scirpus sesquipollicaris Willd. ex Kunth, 1837 |
| Scirpus spadiceus L., 1753 |
| Scirpus subsquarrosus Muhl., 1817 |
| Scirpus subtilis Boeckeler, 1896 |
| Scirpus supinus Boeckeler, 1870 |
| Scirpus tatora Kunth, 1837 |
| Scirpus tenuifolius Rudge, 1805 |
| Scirpus tenuispicatus Boeckeler, 1870 |
| Scirpus umbellatus (Rottb.) Kuntze, 1898 |
| Scirpus vahlii Lam., 1791 |
| Scirpus validus Vahl, 1806 |