| Rhynchospora indianolensis Small, 1903 |
| Rhynchospora intermixta C. Wright, 1871 |
| Rhynchospora inundata (Oakes) Fernald, 1918 |
| Rhynchospora jaliscensis McVaugh, 1990 |
| Rhynchospora jelskiana Boeckeler, 1874 |
| Rhynchospora jubata Liebm., 1850 |
| Rhynchospora kunthii Nees ex Kunth, 1837 |
| Rhynchospora lechleri Steud. ex Boeckeler, 1873 |
| Rhynchospora leucocephala (Michx.) Boeckeler, 1869 |
| Rhynchospora lindeniana Griseb., 1866 |
| Rhynchospora lindeniana var. bahamensis (Britton) Gale, 1944 |
| Rhynchospora longispicata Boeckeler, 1873 |
| Rhynchospora macrochaeta Steud. ex Boeckeler, 1873 |
| Rhynchospora macrochaeta var. ruiziana (Boeckeler) Kük., 1949 |
| Rhynchospora marisculus Lindl. & Nees ex Nees, 1842 |
| Rhynchospora marliniana Naczi, W.M. Knapp & W.W. Thomas, 2012 |
| Rhynchospora mexicana (Liebm.) Steud., 1855 |
| Rhynchospora micrantha Vahl, 1806 |
| Rhynchospora micrantha var. contracta (Nees) Kük., 1951 |
| Rhynchospora microcephala (Bertero ex Spreng.) Kük., 1951 |