Helanthium

About

Helanthium is a genus of plants in the Alismataceae, native to the Western Hemisphere. At present, three species are recognized:Helanthium bolivianum (Rusby) Lehtonen & Myllys - southern Mexico, West Indies, Central America, South America Helanthium tenellum (Mart. ex Schult.f.) J.G.Sm. in N.L.Britton - eastern United States, southern Mexico, West Indies, Central America, South America Helanthium zombiense (Jérémie) Lehtonen & Myllys - Jamaica, Island of Guadeloupe

Summary from Wikipedia