This name is a synonym of Leymus mollis (Trin.) Pilg..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name (record 410872) with original publication details: Fl. Canad. 2: 706 1862.
This name was in version 1 of The Plant List, record kew-410872.