Genus of grass-like plants
Costularia is a plant genus in the family Cyperaceae. It includes 15 species native to southeastern Africa, ranging from South Africa (KwaZulu-Natal and Northern Provinces) through Eswatini, Mozambique, Zimbabwe, and Malawi, and to the islands Madagascar, Réunion, and the Seychelles in the Western Indian Ocean.
The genus was formerly circumscribed to include 25 species. A molecular phylogenetic study found that circumscription to include four distinct lineages: 
In 2019, the genus was revised to include 15 species, generally corresponding to "Costularia s.s." and including a few previously undescribed species.
List of species.
15 species are accepted:
Formerly placed here.
"Xyroschoenus hornei" (as "Costularia hornei" )
References.
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