This name is a synonym of Carex petasata Dewey.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 224305) with original publication details: Fl. Bor.-Amer. 2: 215 1839.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45675-2.
This name was in version 1 of The Plant List, record kew-224305, and has not been changed.