This name is a synonym of Euphorbia humifusa Willd..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38026) with original publication details: J. Fac. Sci. Univ. Tokyo, Sect. 3, Bot. 6: 288 1954.
This name was in version 1 of The Plant List, record kew-38026, and has not been changed.