This name is a synonym of Carex helleri Mack..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50122944) with original publication details: Rep. U.S. Geogr. Surv., Wheeler 6: 278 1879.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45805-2.
This name was in version 1 of The Plant List, record tro-50122944, and has not been changed.