|
''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.〔(Online Atlas of the British and Irish flora, ''Polygonum oxyspermum'' (Ray`s Knotgrass) )〕 It is also naturalized in eastern Canada and in the US State of Maine.〔(Go Botany, New England Wildflower Society )〕〔(Wilde Planten in Nederland en België, Zandvarkensgras ) in Dutch with photos and global distribution map〕 ==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,〔(Flora of North America, ''Polygonum oxyspermum'' C. A. Meyer & Bunge ex Ledebour, 1824. )〕in axillary clusters.〔Parnell, J. and Curtis, T. 2012. ''Webb's An Irish Flora.'' Cork University Press. ISBN 978-185918-4783〕 ;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 Scotia〔(Biota of North America Program 2014 state-level distribution map, ''Polygonum oxyspermum'' )〕 * ''Polygonum oxyspermum'' subsp. ''raii'' (Bab.) D.A.Webb & Chater northern Europe; naturalized in Nova Scotia, Prince Edward Island, New Brunswick, Québec, Maine, Newfoundland〔(Biota of North America Program 2014 state-level distribution map, ''Polygonum raii'' )〕 * ''Polygonum oxyspermum'' subsp. ''robertii'' (Loisel.) Akeroyd & D.A.Webb - Italy 〔(Acta Plantarum, ''Polygonum robertii'' Loisel. - Poligono di Robert )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polygonum oxyspermum」の詳細全文を読む スポンサード リンク
|
