Costularia is a plant genus in the family Cyperaceae. It includes four distinct lineages: Costularia s.s. (11 subspecies) from Africa, Madagascar, the Mascarene Islands and Seychelles. Chamaedendron Larridon (five subspecies) from New Caledonia. a group largely conforming to subgenus, Lophoschoenus (eight subspecies) from New Caledonia and Malesia that are now considered to be part of a redelimited genus Tetraria, which are found on the island of Madagascar. the species Xyroschoenus hornei which is endemic to the Seychelles.
List of species
Costularia arundinacea (Sol. ex Vahl) Kük. Costularia brevifolia Cherm. Costularia breviseta J.Raynal Costularia cadetii Larridon 2019 Costularia chamaedendron (Guill.) Kük. Costularia comosa (C.B.Clarke) Costularia elongata (Kunth) Kük. Costularia fragilis (Däniker) Kük. Costularia hornei (C.B.Clarke) Kük. Costularia humbertii Bosser Costularia laxa Cherm. Costularia leucocarpa (Ridl.) Pfeiff. Costularia melicoides (Poir.) C.B.Clarke Costularia melleri (Baker) C.B.Clarke Costularia microcarpa (Cherm.) Kük. Costularia neocaledonica (C.B.Clarke) Rendle Costularia nervosa J.Raynal Costularia pantopoda (Baker) C.B.Clarke Costularia pilisepala (Steud.) F.Kern Costularia pilisepla (Steud.) J. Kern Costularia pubescens J.Raynal Costularia purpurea Cherm. Costularia setacea J.Raynal Costularia stagnalis (Däniker) Kük. Costularia sylvestris J.Raynal Costularia xyridioides (Däniker) Kük.