This name is a synonym of Euphorbia adenoptera subsp. canescens (Proctor) Oudejans.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 37835) with original publication details: Moscosoa 2: 23 1983.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:308062-2.
This name was in version 1 of The Plant List, record kew-37835, and has not been changed.