| Lupinus persistens Rose, 1905 |
| Lupinus pilosissimus M. Martens & Galeotti, 1843 |
| Lupinus platamodes C.P. Sm., 1941 |
| Lupinus polycarpus Greene, 1888 |
| Lupinus potosinus Rose, 1905 |
| Lupinus potosinus var. bartlettii C.P. Sm., 1938 |
| Lupinus pringlei Rose, 1905 |
| Lupinus pulchellus Sweet, 1835 |
| Lupinus quercuum C.P. Sm., 1938 |
| Lupinus reflexus Rose, 1905 |
| Lupinus rhodanthus C.P. Sm., 1939 |
| Lupinus rivularis Douglas ex Lindl., 1833 |
| Lupinus rivularis var. latifolius (Lindl. ex J. Agardh) S. Watson, 1873 |
| Lupinus rotundiflorus M.E. Jones, 1929 |
| Lupinus rotundifolius Sessé & Moc., 1894 |
| Lupinus ruber A. Heller, 1905 |
| Lupinus semiaequus C.P. Sm., 1942 |
| Lupinus simulans Rose, 1905 |
| Lupinus sinaloensis C.P. Sm., 1949 |
| Lupinus sitgreavesii S. Watson, 1873 |