| Romanschulzia schistacea Rollins, 1956 |
| Romanschulzia subclavata Rollins, 1956 |
| Romanschulzia turritoides (Loes.) O. E. Schulz, 1933 |
| Roripella (Maire) Greuter & Burdet, 1983 |
| Rorippa Scop., 1760 |
| Rorippa clavata Rydb., 1902 |
| Rorippa curvipes Greene, 1896 |
| Rorippa curvisiliqua (Hook.) Bessey ex Britton, 1894 |
| Rorippa dictyota Greene, 1894 |
| Rorippa gambellii (S. Watson) Rollins & Al-Shehbaz, 1988 |
| Rorippa heterophylla (Blume) R. O. Williams, 1929 |
| Rorippa indica (L.) Hiern, 1896 |
| Rorippa indica var. indica (L.) Hiern, 1896 |
| Rorippa intermedia (Kuntze) Stuckey, 1972 |
| Rorippa islandica (Oeder) Borbás, 1900 |
| Rorippa islandica subsp. fernaldiana (Butters & Abbe) Hultén, 1967 |
| Rorippa islandica var. fernaldiana Butters & Abbe, 1940 |
| Rorippa islandica var. microcarpa (Regel) Fernald, 1940 |
| Rorippa islandica var. occidentalis (S. Watson) Butters & Abbe, 1940 |
| Rorippa mexicana (DC.) Standl. & Steyerm., 1944 |