This name is a synonym of Calamagrostis canescens (Weber) Roth.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 402532) with original publication details: Ber. Deutsch. Bot. Ges. 77: 145 1964.
This name was in version 1 of The Plant List, record kew-402532.