This name is a synonym of Carex sociata Boott.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 224783) with original publication details: J. Coll. Sci. Imp. Univ. Tokyo 30(1): 379 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:298707-1.
This name was in version 1 of The Plant List, record kew-224783.