This name is a synonym of Elymus farctus (Viv.) Runemark ex Melderis.
The record derives from WCSP which reports it as a synonym (record 388529) with original publication details: Ess. Agrostogr. 102 1812.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:385041-1.