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Bidens cernua


Bidens cernua is a plant species in the sunflower family, widespread across much of Eurasia and North America.<ref name=x>Flora of North America, Bidens cernua Linnaeus, Sp. Pl. 2: 832. 1753. </ref><ref>Flora of China, 柳叶鬼针草 liu ye gui zhen cao, Bidens cernua Linnaeus, Sp. Pl. 2: 832. 1753</ref><ref>Biota of North America Program 2014 county distribution map</ref><ref>Altervista Flora Italiana, Forbicina intera, Bidens cernua L. includes photos and European distribution map</ref> It is commonly called nodding beggarticks<ref>Template:Cite book</ref> or nodding bur-marigold,<ref name=BSBI07>Template:Cite web</ref>

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.<ref name=x/>