This name is a synonym of Bromus berteroanus Colla.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 397753) with original publication details: Linnaea 29: 94 1858.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:391657-1.
This name was in version 1 of The Plant List, record kew-397753.