European knotweed
- kingdom: Plantae
- phylum: Tracheophyta
- class: Magnoliopsida
- order: Caryophyllales
- family: Polygonaceae
- genus: Polygonum
- species: Polygonum arenarium
Brussels
Brussels Capital
Belgium
Erythrés
Attica- Asproválta
- Náousa
Central Macedonia- Igoumenítsa
- Kompóti
- Pediní
- Rodotópion
Epirus- Gargaliánoi
- Skála
Peloponnese- Kastrákion
Thessaly- Kalávryta
- Kamárai
- Selianítika
- Thérmo
West Greece
Greece