This name is a synonym of Elymus mutabilis (Drobow) Tzvelev.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 388665) with original publication details: Spisok Rosl. Gerb. Fl. U.S.R.R. 14: 8 1957.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:385145-1.
This name was in version 1 of The Plant List, record kew-388665.