This name is a synonym of Euphorbia perlignea McVaugh.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 38162) with original publication details: J. Arnold Arbor. 48: 421 1967.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:55376-2.
This name was in version 1 of The Plant List, record kew-38162, and has not been changed.