This name is a synonym of Elymus macrourus (Turcz.) Tzvelev.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 410845) with original publication details: Taxon 19: 299 1970.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:90166-2.
This name was in version 1 of The Plant List, record kew-410845.