This name is a synonym of Calamagrostis epigejos (L.) Roth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 403216) with original publication details: Bot. Mag. (Tokyo) 40: 326 1926.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:394749-1.
This name was in version 1 of The Plant List, record kew-403216.