This name is a synonym of Euphorbia portucasadiana (Croizat) Subils.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38182) with original publication details: J. Arnold Arbor. 24: 186 1943.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:55397-2.
This name was in version 1 of The Plant List, record kew-38182, and has not been changed.