| Radicula williamsii (Britton) A. Heller, 1912 |
| Rapa Mill., 1754 |
| Raparia F.K. Mey., 1973 |
| Raphaneae DC., 1821 |
| Raphanorhyncha Rollins, 1976 |
| Raphanorhyncha crassa Rollins, 1976 |
| Raphanus L., 1753 |
| Raphanus lanceolatus Willd., 1800 |
| Raphanus raphanistrum L., 1753 |
| Raphanus sativus L., 1753 |
| Rapistrum Crantz, 1769 |
| Rapistrum rugosum (L.) All., 1785 |
| Rhamphospermum Andrz. ex Besser., 1822 |
| Rhamphospermum nigrum (L.) Al-Shehbaz, 2021 |
| Rodschiedia P. Gaertn., B. Mey. & Scherb., 1800 |
| Rollinsia Al-Shehbaz, 1982 |
| Romanschulzia O.E. Schulz, 1933 |
| Romanschulzia arabiformis (DC.) Rollins, 1942 |
| Romanschulzia arabiformis var. lasiocarpa (O.E. Schulz) Rollins, 1942 |
| Romanschulzia australis (Brandegee) Rollins, 1942 |