Pictorial guide to the flora of the British Isles

Home ⟩ Pictorial Guide ⟩ Polygonaceae ⟩ Polygonum boreale / northern knotgrass

Polygonum boreale (Lange) Small

northern knotgrass (Polygonaceae)

 SpreadBias within British IslesDirection of bias
RestrictedVery strong tendencyN
Plant Atlas 2020
BSBI Distribution Map

Polygonum boreale is a knotgrass found only in Scotland, usually close to the coast.

Littleferry (VC107: East Sutherland); 2020-07-19

 northern knotgrass / Polygonum boreale: _Polygonum boreale_ is a knotgrass found only in Scotland, usually close to the coast.

Polygonum boreale differs from Polygonum aviculare in having leaves that are widest in the distal half, with the longer petiole visible beyond the stipules, and by its larger achenes.

Littleferry (VC107: East Sutherland); 2020-07-19

 northern knotgrass / Polygonum boreale: _Polygonum boreale_ differs from _Polygonum aviculare_ in having leaves that are widest in the distal half, with the longer petiole visible beyond the stipules, and by its larger achenes.

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