This name is a synonym of Euphorbia deltoidea subsp. adhaerens (Small) Oudejans.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 37939) with original publication details: Rhodora 95(881): 48 1993.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1160851-2.
This name was in version 1 of The Plant List, record kew-37939, and has not been changed.