This name is a synonym of Euphorbia biconvexa Domin.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 37873) with original publication details: Austral. J. Bot. 24: 640 1976.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:340558-1.
This name was in version 1 of The Plant List, record kew-37873, and has not been changed.