This name is a synonym of Carex aquatilis var. dives (Holm) Kük..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 330726) with original publication details: Biol. Leafl. 66: 34 1953.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45758-2.
This name was in version 1 of The Plant List, record kew-330726, and has not been changed.