The other common knotgrass species, polygonum aviculare, has leaves up to three times smaller on the side branches; for polygonum arenastrum the leaves are all equal in size.
Common name:
Equal-leaved knotgrass
Family:
Scientific name:
Polygonum arenastrum
Main flower color:
Range:
Most of the British Isles; least common in north Scotland
Height:
Usually around 20 cm or less - forms low clumps
Habitat:
Disturbed ground, fields, roadsides, beach margins
Flowers:
Small, with five green tepals, resembling a calyx, and five petaloid lobes, white to pale pink, which are fused for half or more of their length. Flowers are produced singly or in small clusters, from the leaf nodes
Leaves:
Ovate, equal in size on both main and side branches
Season:
June to October
Rarity:
★★★★★
