Helanthium tenellum
- kingdom: Plantae
- phylum: Tracheophyta
- class: Liliopsida
- order: Alismatales
- family: Alismataceae
- genus: Helanthium
- species: Helanthium tenellum
Barreiras
Bahia- Pontes e Lacerda
Mato Grosso- Aquidauana
- Corumbá
Mato Grosso do Sul- Tanabi
São Paulo
Brazil
West Hartford
Connecticut- Virginia
Illinois- Winchester
- Woburn
Massachusetts
United States