This name is a synonym of Atriplex paludosa subsp. baudinii (Moq.) Aellen.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Prodr. 13(2): 102 1849.
This name was in version 1 of The Plant List, record kew-2665603, and has not been changed.