Knotweed
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Caryophyllales
- family: Polygonaceae
- genus: Persicaria
- species: Persicaria posumbu
Branford- Branford Center
- Coventry Lake
- New Haven
- Poquonock Bridge
Connecticut- Bingham Farms
Michigan- Borough of Bronx
- Brewster
- Carmel
- Lake Carmel
New York- James City
- New Bern
North Carolina- Columbia
- Wrightsville
Pennsylvania- Washington, D. C.
Washington, D.C.
United States