This name is a synonym of Cyperus niveus var. leucocephalus (Kunth) Fosberg.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 237767) with original publication details: Enum. Pl. Obs. 2: 308 1805.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:305356-1.
This name was in version 1 of The Plant List, record kew-237767.