This name is a synonym of Atriplex paludosa subsp. cordata (Benth.) Aellen.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bot. Jahrb. Syst. 68: 404 1938.
This name was in version 1 of The Plant List, record kew-2665601, and has not been changed.