Polygonaceae
Horse-tail knotweed
Polygonum equisetiforme
- Family
- Polygonaceae
- Genus
- Polygonum
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Common names
By language (4)
- Arabic
- Qordaab- عشبة القرضاب
- English
- Horse-tail knotweed
- Hebrew
- ארכובית שבטבטית
- Korean
- 개마디풀
Flowers
- In flower
- June to January (from 123 flowering iNaturalist observations worldwide)
Photos
FlowerPhoto: Eleftherios Katsillis, CC BY 4.0, from iNaturalist 
FlowerPhoto: Duarte Frade, CC BY 4.0, from iNaturalist 
FlowerPhoto: Daniel Cahen, CC BY 4.0, from iNaturalist 
FlowerPhoto: Eleftherios Katsillis, CC BY 4.0, from iNaturalist 
Photo: Zeynel Cebeci, CC BY-SA 4.0, from Wikimedia Commons Photo: conrado.fresno, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0, from Wikimedia Commons Photo: Emre Karaca, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0, from Wikimedia Commons Photo: Nami, CC BY-SA 4.0, from Pl@ntNet via GBIF 
Photo: Astra, CC BY 4.0, from iNaturalist 
Photo: Krzysztof Ziarnek, Kenraiz, CC BY-SA 4.0, 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
- KnotweedPolygonum oxyspermumPolygonaceae
- Douglas' knotweedPolygonum douglasiiPolygonaceae
- Erect knotweedPolygonum erectumPolygonaceae
- Polygonum humifusumPolygonaceae
Sources: classification from World Flora Online Plant List (2026-06, CC0 1.0); common names, popularity from Wikidata (2026-10-26, CC0 1.0); US characteristics from USDA PLANTS Database (2025-05-29, CC0 1.0). About our plant data.