This name is a synonym of Euphorbia linguiformis McVaugh.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38072) with original publication details: Contr. Univ. Michigan Herb. 19: 212 1993.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:971824-1.
This name was in version 1 of The Plant List, record kew-38072, and has not been changed.