| Rhynchospora nivea Boeckeler, 1873 |
| Rhynchospora oaxacana Kral & W.W. Thomas, 1986 |
| Rhynchospora oligantha A. Gray, 1835 |
| Rhynchospora orizabensis C.B. Clarke ex Kük., 1949 |
| Rhynchospora penniseta Griseb., 1866 |
| Rhynchospora perrigida Boeckeler, 1896 |
| Rhynchospora persooniana (Nees) Griseb., 1864 |
| Rhynchospora plumosa Elliot, 1816 |
| Rhynchospora podosperma C. Wright, 1871 |
| Rhynchospora polyphylla (Vahl) Vahl, 1805 |
| Rhynchospora pringlei Greenm., 1903 |
| Rhynchospora pterocarpa (Kunth) Roem. & Schult., 1817 |
| Rhynchospora pubera (Vahl) Boeckeler, 1872 |
| Rhynchospora pubera f. elatior Duss, 1896 |
| Rhynchospora pubera var. microcarpa Boeckeler, 1872 |
| Rhynchospora pungens Liebm., 1850 |
| Rhynchospora pura (Nees) Griseb., 1864 |
| Rhynchospora pusilla Chapm. ex M.A. Curtis, 1849 |
| Rhynchospora radicans (Schltdl. & Cham.) H. Pfeiff., 1935 |
| Rhynchospora radicans subsp. microcephala (Bertero ex Spreng.) W.W. Thomas, 1984 |