Polygonaceae
European knotweed
Polygonum arenarium
- Family
- Polygonaceae
- Genus
- Polygonum
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Common names
By language (8)
- Chinese
- 沙生萹蓄, 沙生萹蓄（新拟）
- Croatian
- Pješčani dvornik
- English
- European knotweed, Lesser red knotgrass
- Estonian
- Liiv-kirburohi
- Macedonian
- Песочна подворка
- Russian
- Горец песчаный
- Swedish
- Fransk trampört
- Welsh
- Y canclwm coch bach
Synonyms
- Polygonum janatae Klokov
- Polygonum pseudoarenarium Klokov
- Polygonum venantianum Clem.
Characteristics
- Growth habit
- Forb/herb
- Lifespan
- Annual
- In the US and Canada
- Lower 48 states: introduced
Photos
Photo: Igor Balashov, CC BY 4.0, from Wikimedia Commons
More in Polygonum
- Yard knotweedPolygonum avicularePolygonaceae
- Oval-leaf knotweedPolygonum arenastrumPolygonaceae
- Polygonum maritimumPolygonaceae
- Asiatic tearthumbPolygonum perfoliatumPolygonaceae
- Bellard's smartweedPolygonum patulumPolygonaceae
- Narrowleaf knotweedPolygonum bellardiiPolygonaceae
- Polygonum cognatumPolygonaceae
- Horse-tail knotweedPolygonum equisetiformePolygonaceae
- KnotweedPolygonum oxyspermumPolygonaceae
- Douglas' knotweedPolygonum douglasiiPolygonaceae
- Erect knotweedPolygonum erectumPolygonaceae
- Polygonum humifusumPolygonaceae
Sources: classification, synonyms from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); common names, US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.