This name is a synonym of Carex × rieseana Figert.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 349366) with original publication details: Allg. Bot. Z. Syst. 9: 112 1902 publ. 1903.
This name was in version 1 of The Plant List, record kew-349366, and has not been changed.