This name is a synonym of Carex bigelowii subsp. ensifolia (Turcz. ex Gorodkov) Holub..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 226352) with original publication details: Fl. URSS 3: 227 1935.
This name was in version 1 of The Plant List, record kew-226352, and has not been changed.