This name is a synonym of Atriplex argentea var. longitrichoma (Stutz, G.L.Chu & S.C.Sand.) S.L.Welsh.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Madroño 45: 128 1998 publ. 1999.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1007366-1.
This name was in version 1 of The Plant List, record kew-2665470, and has not been changed.