This name is a synonym of Euphorbia portulacoides subsp. collina (Phil.) Croizat.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 79039) with original publication details: Linnaea 29: 41 1858.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:346071-1.
This name was in version 1 of The Plant List, record kew-79039, and has not been changed.