This name is a synonym of Atriplex prostrata subsp. calotheca (Rafn) M.A.Gust..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name with original publication details: Prodr. Stirp. Chap. Allerton 152 1796.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:163848-1.
This name was in version 1 of The Plant List, record kew-2665350.