| Lathyrus brachycalyx subsp. eucosmus (Butters & H. St. John) S.L. Welsh, 1966 |
| Lathyrus brachycalyx var. eucosmus (Butters & H. St. John) S.L. Welsh, 1978 |
| Lathyrus crassipes Gillies ex Hook. & Arn., 1833 |
| Lathyrus dicirrhus Clos, 1847 |
| Lathyrus diffusus G. Don, 1832 |
| Lathyrus dissitifolius Nutt. ex Torr. & A. Gray, 1838 |
| Lathyrus engelmanni Bisch., 1839 |
| Lathyrus eucosmus Butters & H. St. John, 1917 |
| Lathyrus graminifolius (S. Watson) T.G. White, 1894 |
| Lathyrus guaraniticus Hassl., 1919 |
| Lathyrus laetiflorus Greene, 1893 |
| Lathyrus laetiflorus subsp. alefeldii (T.G. White) Bradshaw, 1925 |
| Lathyrus laetiflorus subsp. glaber C.L. Hitchc., 1952 |
| Lathyrus lanszwertii Kellogg, 1861 |
| Lathyrus lanszwertii var. arizonicus (Britton) S.L. Welsh, 1978 |
| Lathyrus lanszwertii var. leucanthus (Rydb.) Dorn, 1988 |
| Lathyrus latifolius L., 1753 |
| Lathyrus linearis Nutt., 1838 |
| Lathyrus longipes Phil., 1856 |
| Lathyrus montevidensis Vogel, 1839 |