Himalayan knotweed
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Caryophyllales
- family: Polygonaceae
- genus: Koenigia
- species: Koenigia polystachya
Lunang
Tibet
China
Fort William
Scotland
United Kingdom
Beaver Creek- Coquille
- Monmouth
Oregon- Issaquah
- Snoqualmie
Washington
United States
Aalst
Tranås