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Sea Knotgrass

Polygonum maritimum

Please keep in mind that it is illegal to uproot a plant without the landowner's consent and care should be taken at all times not to damage wild plants. Wild plants should never be picked for pleasure and some plants are protected by law.
For more information please download the BSBI Code of Conduct PDF document.

Plant Data

Flowering Months:
JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
Order:
Caryophyllales
Family:
Polygonaceae (Dock)
Type:
Flower
Life Cycle:
Perennial
Maximum Size:
50 centimetres tall
Habitats:
Beaches, sand dunes, seaside.

Flower:
֍
Pink, 5 petals
 
Pinkish-white flowers clustered together in groups of 1 to 4. The flowers are borne in the leaf axils where they meet the stems. Just like the similar looking Ray's Knotgrass (Polygonum oxyspermum), the flowers are large for a knotgrass.
Fruit:
The fruit is an achene.
Leaves:
UK's rarest knotgrass species and the only one which is always perennial. Sea Knotgrass is a prostrate plant with slightly leathery, broadly oval leaves. The margins of the leaves are down-turned.
Frequency (UK):
Rarely seen  
Similar Species:
Distribution Map

Reproduced by kind permission of the BSBI.

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