This name is a synonym of Atriplex elegans var. thornberi M.E.Jones.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Gen. Techn. Rep. R.M. U.S. Forest Serv. RM-57: 30 1978.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:60447656-2.
This name was in version 1 of The Plant List, record kew-2606363, and has not been changed.