This name is a synonym of Carex breviculmis var. discoidea (Boott) Boott.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 226053) with original publication details: Mem. Amer. Acad. Arts n.s., 6: 419 1859.
This name was in version 1 of The Plant List, record kew-226053, and has not been changed.