This name is a synonym of Euphorbia ruiziana (Klotzsch & Garcke) Boiss..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38220) with original publication details: Monogr. Syst. Bot. Missouri Bot. Gard. 75: 954 1999.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1014813-1.
This name was in version 1 of The Plant List, record kew-38220, and has not been changed.