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 225807) with original publication details: Bot. Not. 124: 326 1971.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:879502-1.
This name was in version 1 of The Plant List, record kew-225807, and has not been changed.