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Chelonanthus is a genus of flowering plants belonging to the family Gentianaceae. Its native range is Tropical America. Species: Chelonanthus hamatus Lepis Chelonanthus longistylus (J.G.M.Pers. & Maas) Struwe & V.A.Albert Chelonanthus matogrossensis (J.G.M.Pers. & Maas) Struwe & V.A.Albert Chelonanthus pterocaulis Lepis Chelonanthus purpurascens (Aubl.) Struwe, S.Nilsson & V.A.Albert