| Name | Euphorbia arkansana var. atrosemina Norton |
| Authorship | Norton |
| Rank | Variety |
| NomenclaturalStatus | NomLeg |
| Placed in | Euphorbia arkansana Engelmann & A. Gray |
| GUID | urn:lsid:ipni.org:names:101302-2 |
| Citation | 1899 Rep. (Annual) Missouri Bot. Gard. 11: 105 |
| Holdings | 8 Specimens held in the Harvard University Herbaria identified as Euphorbia arkansana var. atrosemina Norton |
| Identification made in | 1899 (2), 2009 (2), 2017 (4) |
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