| Name | Euphorbia fendleri var. chaetocalyx Boissier |
| Authorship | Boissier |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Euphorbia fendleri Torrey & A. Gray |
| GUID | urn:lsid:ipni.org:names:321054-2 |
| Citation | 1862 Prodr. [A. P. de Candolle] 15(2): 39 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Euphorbia fendleri var. chaetocalyx Boissier |
| Identification made in | [no date] (1), 1939 (1) |