This name is a synonym of Carex × gaudiniana Guthnick.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 225125) with original publication details: Kongl. Vetensk. Acad. Handl. 14: 199 1857.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:298938-1.
This name was in version 1 of The Plant List, record kew-225125, and has not been changed.