| Name | Euphorbia petrina S. Watson |
| Authorship | S. Watson |
| Rank | Species |
| NomenclaturalStatus | NomLeg |
| Placed in | Euphorbia Linnaeus |
| GUID | urn:lsid:ipni.org:names:101841-2 |
| Citation | 1889 Proc. Amer. Acad. Arts 24: 75 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Euphorbia petrina S. Watson |
| Identification made in | [no date] (2), 1934 (1) |