This name is a synonym of Atriplex montevidensis Spreng..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 7202352) with original publication details: Bull. Soc. Bot. France 54: 585 1907.
This name was in version 1 of The Plant List, record tro-7202352, and has not been changed.