| Lotus scoparius (Nutt. ex Torr. & A. Gray) Ottley, 1923 |
| Lotus strigosus (Nutt. ex Torr. & A. Gray) Greene, 1890 |
| Lotus strigosus var. tomentellus (Greene) Isely, 1978 |
| Lotus tomentellus Greene, 1890 |
| Lotus tomentosus (Hook. & Arn.) Greene, 1890 |
| Lotus torreyi (A. Gray) Greene, 1890 |
| Lotus utahensis Ottley, 1944 |
| Lotus watsonii (Vasey & Rose) Greene, 1890 |
| Lotus wrightii (A. Gray) Greene, 1890 |
| Lupinaster Fabr., 1759 |
| Lupinaster amabilis (Kunth) C. Presl, 1830 |
| Lupinaster wormskioldii (Lehm.) C. Presl, 1830 |
| Lupinus L., 1753 |
| Lupinus albifrons Benth., 1835 |
| Lupinus albifrons var. eminens (Greene) C.P. Sm., 1925 |
| Lupinus altissimus Sessé & Moc., 1889 |
| Lupinus andersonii S. Watson, 1871 |
| Lupinus aralloius C.P. Sm., 1942 |
| Lupinus arizonicus (S. Watson) S. Watson, 1877 |
| Lupinus aschenbornii S. Schauer, 1847 |