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 388971) with original publication details: Byull. Moskovsk. Obshch. Isp. Prir., Otd. Biol. n.s., 47: 85 1938.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:385309-1.
This name was in version 1 of The Plant List, record kew-388971.