This name is a synonym of Elymus multisetus (J.G.Sm.) Burtt Davy.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 443144) with original publication details: Bull. Div. Agrostol. U.S.D.A. 18: 11 1899.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:237854-2.
This name was in version 1 of The Plant List, record kew-443144.