large knotweed
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Caryophyllales
- family: Polygonaceae
- genus: Polygonum
- species: Polygonum majus
Venâncio Aires
Rio Grande do Sul
Brazil
Osoyoos
British Columbia
Canada
Dallesport- Entiat
- Kittitas
- Omak
- Pasco
- Pullman
- Spokane
- White Salmon
Washington
United States