| Name | Euphorbia capitellata var. laxiflora S. Watson |
| Authorship | S. Watson |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Euphorbia capitellata Engelmann |
| GUID | urn:lsid:ipni.org:names:101382-2 |
| Citation | 1889 Proc. Amer. Acad. Arts 24: 74 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Euphorbia capitellata var. laxiflora S. Watson |
| Identification made in | [no date] (1), 1939 (1) |