Fosberg FR (1977) Miscellaneous Notes on the Flora of Aldabra and Neighbouring Islands: IV: A New Bulbostylis and Observations on Cyperus (Cyperaceæ). Kew Bulletin 31(4): 829-835. doi: 10.2307/4109553.
There is no corrections for Cyperus niveus var. leucocephalus yet.