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 237771) with original publication details: Pflanzenr. IV, 20(101): 287 1936.
This name was in version 1 of The Plant List, record kew-237771.