Cyperus sexangularis
Cyperus sexangularis is a species of sedge that is native southern Africa, including Zimbabwe, Botswana, Namibia, Eswatini, and the Northern Provinces and Cape Provinces of South Africa. See also 
 List of Cyperus species

References 

sexangularis
Plants described in 1835
Flora of Botswana
Flora of the Cape Provinces
Flora of Namibia
Flora of the Northern Provinces
Flora of Swaziland
Flora of Zimbabwe
Taxa named by Christian Gottfried Daniel Nees von Esenbeck