This name is a synonym of Carex scopulorum var. bracteosa (L.H.Bailey) F.J.Herm..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 225068) with original publication details: Amer. J. Sci. IV, 20: 302 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:45882-2.
This name was in version 1 of The Plant List, record kew-225068, and has not been changed.