Polygonum oxyspermum is green or blue-green. Annual, stems prostrate, generally run along the surface of the ground but sometimes do rise above ground level. They can be as much as long. Leaves are up to long. Flowers are green, white or pink, in axillary clusters. ;Subspecies Three subspecies are widely recognized, although some authors prefer to regard them as distinct species. •
Polygonum oxyspermum subsp.
raii (Bab.) D.A.Webb & Chater northern Europe; naturalized in
Nova Scotia,
Prince Edward Island,
New Brunswick,
Québec,
Maine,
Newfoundland •
Polygonum oxyspermum subsp.
robertii (Loisel.) Akeroyd & D.A.Webb –
Italy ==References==