This name is a synonym of Carex druceana var. astonii (Hamlin) Edgar.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 224695) with original publication details: Rec. Domin. Mus. 6: 102 1968.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:298683-1.
This name was in version 1 of The Plant List, record kew-224695, and has not been changed.