| Name | Lathyrus brachycalyx subsp. eucosmus (Butters & H. St. John) S. L. Welsh |
| Authorship | (Butters & H. St. John) S. L. Welsh |
| Rank | Subspecies |
| NomenclaturalStatus | NomLeg |
| Placed in | Lathyrus brachycalyx Rydberg |
| Holdings | 44 Specimens held in the Harvard University Herbaria identified as Lathyrus brachycalyx subsp. eucosmus (Butters & H. St. John) S. L. Welsh |
| Identification made in | [no date] (38), 1978 (6) |
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