This name is a synonym of Agrostis mertensii Trin..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 389908) with original publication details: Naturaliste Canad. 113: 331 1986.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:271896-2.
This name was in version 1 of The Plant List, record kew-389908.