This name is a synonym of Euphorbia petiolata Banks & Sol..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 80492) with original publication details: Syst. Veg. 3: 792 1826.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:347049-1.
This name was in version 1 of The Plant List, record kew-80492.