This name is a synonym of Euphorbia sparrmanii Boiss..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50105988) with original publication details: J. Fac. Sci. Univ. Tokyo, Sect. 3, Bot. 6(6): 277 1954.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:340850-1.
This name was in version 1 of The Plant List, record tro-50105988, and has not been changed.