This name is a synonym of Luzula multiflora subsp. frigida (Buchenau) V.I.Krecz..
The record derives from IOPI
(data supplied on 2012-03-23)
which reports it as a synonym (record 316743) with original publication details: Rhodora 47: 265 1945.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:146279-2.
This name was in version 1 of The Plant List, record kew-316743.