| Lotus nummulus Dayton, 1927 |
| Lotus nuttallianus Greene, 1890 |
| Lotus oblongifolius (Benth.) Greene, 1890 |
| Lotus ornithopus (Greene) Greene, 1890 |
| Lotus oroboides (Kunth) Ottley, 1939 |
| Lotus oroboides var. nanus Isely, 1978 |
| Lotus oroboides var. nummularius (M.E. Jones) Isely, 1978 |
| Lotus oroboides var. plebeius (Brandegee) Ottley, 1944 |
| Lotus oroboides var. ramulosus (M.E. Jones) Ottley, 1944 |
| Lotus pinnatus Hook., 1829 |
| Lotus plebeius (Brandegee) Barneby, 1986 |
| Lotus procumbens (Greene) Greene, 1890 |
| Lotus procumbens var. procumbens (Greene) Greene, 1890 |
| Lotus prostratus L., 1759 |
| Lotus racemosus Sessé & Moc., 1894 |
| Lotus ramulosus M.E. Jones, 1929 |
| Lotus repens (G. Don) Sessé & Moc. ex Standl. & Steyerm., 1946 |
| Lotus rigidus (Benth.) Greene, 1890 |
| Lotus rubellus (Nutt. ex Torr. & A. Gray) Greene, 1890 |
| Lotus salsuginosus Greene, 1890 |