This name is a synonym of Luzula acuminata subsp. carolinae (S.Watson) Z.Kaplan.
The record derives from IOPI
(data supplied on 2012-03-23)
which reports it as a synonym (record 316130) with original publication details: Rhodora 46: 5 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:146141-2.
This name was in version 1 of The Plant List, record kew-316130, and has not been changed.