Pictorial guide to the flora of the British Isles

Home ⟩ Pictorial Guide ⟩ Polygonaceae ⟩ Koenigia polystachya / Himalayan knotweed

Koenigia polystachya (Wall. ex Meisn.) T. M. Schust. & Reveal

Himalayan knotweed (Polygonaceae)

 SpreadBias within British IslesDirection of bias
WidespreadNegligible tendencySW
Plant Atlas 2020
BSBI Distribution Map

Synonyms | Persicaria wallichii Greuter & Burder | Polygonum polytachyum Wall. ex Meisn.

Koenigia polystachya is native to the Himalayas, but is a frequent survivor of cultivation that spreads vegetatively.

Bucklebury (VC22: Berkshire); 2016-10-16

 Himalayan knotweed / Koenigia polystachya: _Koenigia polystachya_ is native to the Himalayas, but is a frequent survivor of cultivation that spreads vegetatively.

Koenigia polystachya has flowers with unfused petals, and its leaves are truncate or cordate at the base.

Bucklebury (VC22: Berkshire); 2016-10-16

 Himalayan knotweed / Koenigia polystachya: _Koenigia polystachya_ has flowers with unfused petals, and its leaves are truncate or cordate at the base.

All images copyright © Christopher J. Dixon unless otherwise indicated.

L-R: Bidens tripartita, Melilotus officinalis, Mimulus guttatus, Thalictrum flavum, Ranunculus peltatus, Anchusa arvensis, Malva alcea, Lolium perenne