This name is a synonym of Carex capillacea var. sachalinensis (F.Schmidt) Ohwi.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 342710) with original publication details: Acta Phytotax. Geobot. 2: 272 1933.
This name was in version 1 of The Plant List, record kew-342710, and has not been changed.