This name is a synonym of Carex nigra subsp. intricata (Tineo) Rivas Mart..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 225445) with original publication details: Fl. Italia 1: 132 1896.
This name was in version 1 of The Plant List, record kew-225445.