Helanthium

{{Short description|Genus of aquatic plants}}

{{automatic taxobox

|image = Helanthium bolivianum kz01.jpg

|image_caption = Helanthium bolivianum

|taxon = Helanthium

|authority = (Benth. & Hook.f.) Engelm. ex J.G.Sm.Engelmann, Georg ex Smith, Jared Gage in Britton, Nathaniel Lord. 1905. Manual of the Botany of the Northern United States. Second Edition 54.

|type_species = Helanthium tenellum

|type_species_authority = (Mart. ex Schult. & Schult. f.) Britton.

|subdivision_ranks = Species

|subdivision = See text

|synonyms =

}}

Helanthium is a genus of plants in the Alismataceae, native to the Western Hemisphere. At present (May 2014), three species are recognized:[http://apps.kew.org/wcsp/namedetail.do?name_id=371668 Kew World Checklist of Selected Plant Families]{{Dead link|date=July 2024 |bot=InternetArchiveBot |fix-attempted=yes }}

• 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 (from Texas to Florida, north to Michigan and Massachusetts), southern Mexico, West Indies, Central America, South America
• Helanthium zombiense (Jérémie) Lehtonen & Myllys - Jamaica, Island of Guadeloupe