This name is a synonym of Euphorbia kirkii (N.E.Br.) Bruyns.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 198936) with original publication details: Fl. Trop. Afr. 6(1): 466 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:356708-1.
This name was in version 1 of The Plant List, record kew-198936, and has not been changed.