This name is a synonym of Rhynchospora albescens (Miq.) Kük..
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 239544) with original publication details: Bull. Misc. Inform. Kew, Addit. Ser. 8: 32 1908.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:79587-2.
This name was in version 1 of The Plant List, record kew-239544.