| Pseudobraya Korsh., 1896 |
| Psychineae DC., 1821 |
| Pteroneurum DC., 1821 |
| Pterygiosperma O.E. Schulz, 1924 |
| Quidproquo Greuter & Burdet, 1983 |
| Radicula Moench, 1794 |
| Radicula dictyota Greene, 1905 |
| Radicula mexicana (Moc., Sessé & Cerv. ex DC.) Standl., 1925 |
| Radicula pacifica (Howell) Greene, 1905 |
| Radicula sinuata (Nutt.) Greene, 1905 |
| Radicula tenerrima (Greene) Greene, 1905 |
| 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 |