Water star-grass
- kingdom: Plantae
- phylum: Tracheophyta
- class: Liliopsida
- order: Commelinales
- family: Pontederiaceae
- genus: Heteranthera
- species: Heteranthera dubia
Osoyoos
British Columbia- Beauharnois
- Dorval
- Terrebonne
Quebec
Canada
Northport- Spanish Fort
- Tuscaloosa
Alabama- Broad Brook
Connecticut- Chicago
- Lyons
- North Riverside
- Riverside
Illinois- LaPorte
Indiana- Brookmont
- Cabin John
- Forest Heights
- Glassmanor
- Oxon Hill
Maryland- Towanda
Pennsylvania- Alexandria
- Belle Haven
- Huntington
Virginia- Washington, D. C.
Washington, D.C.
United States