| 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 |
| Romanschulzia correllii Rollins, 1984 |
| Romanschulzia elata Rollins, 1942 |
| Romanschulzia guerrerensis Bustam. & R. M. Fonseca, 2009 |
| Romanschulzia mexicana Iltis & Al-Shehbaz, 1993 |
| Romanschulzia meyeri Rollins, 1956 |
| Romanschulzia orizabae (Schltdl. & Cham.) O.E. Schulz, 1933 |
| Romanschulzia resediflora (Kunth) O.E. Schulz, 1933 |
| Romanschulzia resediflora var. lasiocarpa O. E. Schulz, 1933 |
| Romanschulzia rzedowskii Rollins, 1984 |