This name is a synonym of Euphorbia cinerascens Engelm..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 37916) with original publication details: Fl. S.E. U.S. 710 1903.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:55242-2.
This name was in version 1 of The Plant List, record kew-37916, and has not been changed.