This name is a synonym of Carex canescens var. robustior Blytt ex Andersson.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 225277) with original publication details: Syn. Mitteleur. Fl. 2(2): 61 1902.
This name was in version 1 of The Plant List, record kew-225277, and has not been changed.