| Lathyrus laetiflorus subsp. glaber C.L. Hitchc., 1952 |
| Lathyrus latifolius L., 1753 |
| Lathyrus linearis Nutt., 1838 |
| Lathyrus longipes Phil., 1856 |
| Lathyrus montevidensis Vogel, 1839 |
| Lathyrus odoratus L., 1753 |
| Lathyrus palustris L., 1753 |
| Lathyrus palustris var. graminifolius S. Watson, 1888 |
| Lathyrus palustris var. nudicaulis Willk., 1851 |
| Lathyrus parviflorus Roth, 1797 |
| Lathyrus parvifolius S. Watson, 1882 |
| Lathyrus pauciflorus Fernald, 1894 |
| Lathyrus pauciflorus subsp. schaffneri (Rydb.) Piper, 1918 |
| Lathyrus pauciflorus var. schaffneri (Rydb.) Jeps., 1936 |
| Lathyrus polymorphus Nutt., 1818 |
| Lathyrus pusillus Elliott, 1824 |
| Lathyrus schaffneri Rydb., 1900 |
| Lathyrus sphaericus Retz., 1783 |
| Lathyrus splendens Kellogg, 1877 |
| Lathyrus strictus Nutt., 1838 |