This name is a synonym of Calamagrostis fibrovaginata Laegaard.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 396609) with original publication details: Encycl. Suppl. 4: 704 1816.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1064390-2.
This name was in version 1 of The Plant List, record kew-396609, and has not been changed.