This name is a synonym of Carex digitalis var. floridana (L.H.Bailey) Naczi & Bryson.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 9901541) with original publication details: Rhodora 43(514): 544 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:46087-2.
This name was in version 1 of The Plant List, record tro-9901541, and has not been changed.