Polygonaceae
Oval-leaf knotweed
Polygonum arenastrum
- Family
- Polygonaceae
- Genus
- Polygonum
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Common names
By language (13)
- Belarusian
- Драсён тупатун
- Bulgarian
- Пясъчна пача трева
- Chinese
- 伏地蓼, 匍枝蓼, 伏地萹蓄
- Czech
- Truskavec obecný
- English
- Oval-leaf knotweed, Common knotweed, Doorweed, Matweed, Ovalleaf knotweed, Prostrate knotweed
- Estonian
- Harilik linnurohi, Lamav linnurohi
- Finnish
- Tannerpihatatar
- German
- Gleichblättriger Vogelknöterich
- Hebrew
- ארכובית הציפורים
- Macedonian
- Пескољубива подворка
- Persian
- هفتبند شندوست
- Slovenian
- Pohojena dresen
- Welsh
- Y canclwm manddail
Synonyms
- Polygonum acetosellum Klokov
- Polygonum aequale Lindm.
- Polygonum arenastrum subsp. calcatum (Lindm.) Wissk.
- Polygonum arenastrum subsp. microspermum (Jord. ex Boreau) H.Scholz
- Polygonum aviculare subsp. aequale (Lindm.) Asch. & Graebn.
- Polygonum aviculare subsp. calcatum (Lindm.) Thell.
- Polygonum calcatum Lindm.
- Polygonum ebracteatum Munshi & Javeid
- Polygonum microspermum Jord. ex Boreau
- Polygonum montereyense Brenckle
- Polygonum propinquum Ledeb.
Flowers
- In flower
- March, June to October (from 112 flowering iNaturalist observations worldwide)
Characteristics
- Growth habit
- Forb/herb
- Lifespan
- Annual, Perennial
- In the US and Canada
- Alaska: introduced, Canada: introduced, Hawaii: introduced, Lower 48 states: introduced, U.S. Virgin Islands: introduced
Photos
FlowerPhoto: Marc-Aurèle Vallée, CC0, from iNaturalist 
FlowerPhoto: Petr Harant, CC BY 4.0, from iNaturalist 
FlowerPhoto: T. Pedro Hafermann, CC0, from iNaturalist 
Photo: Alexis Tinker-Tsavalas, CC BY 4.0, from iNaturalist 
Photo: Christian Fischer, CC BY-SA 3.0, from Wikimedia Commons Photo: Tenneh Garlimah, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: Alex Zorach, CC BY 4.0, from iNaturalist 
Photo: Harry Rose from South West Rocks, Australia, CC BY 2.0, from Wikimedia Commons Photo: Dillon Keller, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: ajott, CC BY 4.0, from iNaturalist 
Photo: Harry Rose from South West Rocks, Australia, CC BY 2.0, from Wikimedia Commons Photo: elupi, CC BY-SA 4.0, from Pl@ntNet via GBIF
More in Polygonum
- Yard knotweedPolygonum avicularePolygonaceae
- Polygonum maritimumPolygonaceae
- Asiatic tearthumbPolygonum perfoliatumPolygonaceae
- Bellard's smartweedPolygonum patulumPolygonaceae
- European knotweedPolygonum arenariumPolygonaceae
- 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.