This name is a synonym of Euphorbia rockii C.N.Forbes.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38212) with original publication details: Fl. Hawaiiensis 190: Chamaesyce leafl. 4 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:340825-1.
This name was in version 1 of The Plant List, record kew-38212.