| Name | Euphorbia vallis-mortae (Millspaugh) J. T. Howell |
| Authorship | (Millspaugh) J. T. Howell |
| Rank | Species |
| Placed in | Euphorbia Linnaeus |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Euphorbia vallis-mortae (Millspaugh) J. T. Howell |
| Identification made in | [no date] (2), 1936 (1) |