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Bidens cernua
''Bidens cernua'' is a plant species in the sunflower family, widespread across much of Eurasia and North America.〔(Flora of North America, ''Bidens cernua'' Linnaeus, Sp. Pl. 2: 832. 1753. )〕〔(Flora of China, 柳叶鬼针草 liu ye gui zhen cao, ''Bidens cernua'' Linnaeus, Sp. Pl. 2: 832. 1753 )〕〔(Biota of North America Program 2014 county distribution map )〕〔(Altervista Flora Italiana, Forbicina intera, ''Bidens cernua'' L. ) includes photos and European distribution map〕 It is commonly called nodding beggarticks or nodding bur-marigold,
''Bidens cernua'' sometimes grows as high as 400 cm (160 inches) tall in favorable conditions. The leaves are sessile with coarsely-toothed margins. The name ''"cernua"'' means "nodding," or "hanging ." This refers to the fact that the flower heads are sometimes oriented horizontally or downwards. The plant does best in wet habitats such as swamps, marshes, and flood plains.〔
Image:Bidens cernua Sturm18.jpg| 1796 illustration〔illustration from Deutschlands Flora in Abbldungen at http://www.biolib.de Author: Johann Georg Sturm. Painter: Jacob Sturm)〕
Image:Bidens cernua Herbar.jpg| Herbarium specimen collected in Germany
==References==
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「Bidens cernua」の詳細全文を読む
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