Pictorial guide to the flora of the British Isles

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Polygonum maritimum L.

sea knotgrass (Polygonaceae)

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LocalVery strong tendencyS
Plant Atlas 2020
BSBI Distribution Map

Polygonum maritimum is a rare knotgrass, found at a few sites from Cornwall to Sussex, witih outliers in Suffolk and County Donegal; it is larger than its relatives, with ochreae longer than the stem internodes.

Hengistbury Head (VC11: South Hampshire); 2019-07-16

 sea knotgrass / Polygonum maritimum: _Polygonum maritimum_ is a rare knotgrass, found at a few sites from Cornwall to Sussex, witih outliers in Suffolk and County Donegal; it is larger than its relatives, with ochreae longer than the stem internodes.

The flowers of Polygonum maritimum are white and 5-parted, very similar to those of its relatives.

Morbihan (56), France; 2022-05-17

 sea knotgrass / Polygonum maritimum: The flowers of _Polygonum maritimum_ are white and 5-parted, very similar to those of its relatives.

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