This name is a synonym of Carex canescens subsp. disjuncta (Fernald) Toivonen.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 225273) with original publication details: Proc. Amer. Acad. Arts 37: 488 1902.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45919-2.
This name was in version 1 of The Plant List, record kew-225273, and has not been changed.