This name is a synonym of Carex bonariensis Desf. ex Poir..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 330745) with original publication details: Anales Mus. Hist. Nat. Montevideo II, 3: 237 1931.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45874-2.
This name was in version 1 of The Plant List, record kew-330745.