Polygonaceae
Knotweed
Polygonum oxyspermum
- Family
- Polygonaceae
- Genus
- Polygonum
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Common names
By language (10)
- Dutch
- Zandvarkensgras
- English
- Knotweed
- Estonian
- Rand-linnurohi, Rand-kirburohi
- Finnish
- Meritatar
- Latvian
- Asaugļu sūrene
- Norwegian Bokmål
- Nebbslirekne
- Polish
- Rdest nadbrzeżny
- Slovenian
- Rjastoplodna dresen
- Swedish
- Näbbtrampört
- Welsh
- Canclwm Ray
Synonyms
- Polygonum acadiense Fernald
- Polygonum oxyspermum subsp. oxyspermum
Characteristics
- Growth habit
- Forb/herb
- Lifespan
- Perennial
- In the US and Canada
- Canada: introduced
Photos
Photo: Toni Amnell, CC BY-SA 3.0, from Wikimedia Commons 
Photo: Olivier Pichard, CC BY-SA 3.0, from Wikimedia Commons 
Photo: Rudolphous, CC BY-SA 4.0, from Wikimedia Commons 
Photo: Rudolphous, CC BY-SA 4.0, from Wikimedia Commons 
Photo: Sam Thomas, CC BY-SA 2.0, from Wikimedia Commons
More in Polygonum
- Yard knotweedPolygonum avicularePolygonaceae
- Oval-leaf knotweedPolygonum arenastrumPolygonaceae
- Polygonum maritimumPolygonaceae
- Asiatic tearthumbPolygonum perfoliatumPolygonaceae
- Bellard's smartweedPolygonum patulumPolygonaceae
- European knotweedPolygonum arenariumPolygonaceae
- Narrowleaf knotweedPolygonum bellardiiPolygonaceae
- Polygonum cognatumPolygonaceae
- Horse-tail knotweedPolygonum equisetiformePolygonaceae
- 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.