This name is a synonym of Euphorbia catamarcensis (Croizat) Subils.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 37899) with original publication details: J. Arnold Arbor. 24: 187 1943.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:55234-2.
This name was in version 1 of The Plant List, record kew-37899, and has not been changed.