This name is a synonym of Euphorbia herbstii (W.L.Wagner) Oudejans.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38004) with original publication details: Bishop Mus. Occas. Pap. 28: 75 1988.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:934718-1.
This name was in version 1 of The Plant List, record kew-38004.