Polygonum oxyspermum
Polygonum oxyspermum is a coastal species of flowering plant in the buckwheat family. It is native to Europe, primarily along the shores of the Atlantic, the North Sea, and the Baltic Sea, from France and Ireland to Finland and Russia. It is also naturalized in eastern Canada and in the US State of Maine.
Description
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. oxyspermum – northern Europe; naturalized in Nova ScotiaPolygonum oxyspermum subsp. raii D.A.Webb & Chater northern Europe; naturalized in Nova Scotia, Prince Edward Island, New Brunswick, Québec, Maine, NewfoundlandPolygonum oxyspermum subsp. robertii Akeroyd & D.A.Webb – Italy