This name is a synonym of Calamagrostis inexpansa A.Gray.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym and as a spelling variant (record 402698) with original publication details: Bull. Torrey Bot. Club 69: 464 1942.
This name was in version 1 of The Plant List, record kew-402698.