| Name | Euphorbia dentata var. rigida Engelmann |
| Authorship | Engelmann |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Euphorbia dentata Michaux |
| Citation | 1859 Rep. U.S. Mex. Bound., Bot. 190 |
| Holdings | 4 Specimens held in the Harvard University Herbaria identified as Euphorbia dentata var. rigida Engelmann |
| Identification made in | [no date] (2), 1996 (2) |
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