The record derives from WCSP
(data supplied on )
which reports it as a synonym and as an invalid name (record
402524) with original publication details: Acta Bot. Acad. Sci. Hung. 17: 122 1971 publ. 1972.
Full publication details for this name can be found in IPNI:
This name record (from WCSP) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Calamagrostis canescens in version 1 of The Plant List.