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Nodding Beggarticks or Bur-marigold (Bidens cernua var. radiata), fam. Asteraceae.
Common in the same conditions as the usual Threelobe Beggarticks – along the rivers and lakes, but occurs more sparsely. Other biological features are also similar – these plants are annual, bloom in late summer, bear fruits in autumn (when you would better not go into beggarticks thickets), and have medicinal value. The inflorescences of the nodding beggarticks are quite different – they are quite large and beautiful, arranged like in a sunflower: ligular sterile flowers ("petals") surround the small fertile ones. On the contrary, the common threelobe beggarticks are devoid of these radial "petals", that is why their inflorescences look quite inconspicuous. The nodding beggarticks can be also distinguished by whole leaves. At the same time, the threelobe beggarticks have ternary leaves, and a close species Leafy Beggarticks (Bidens frondosa, recently came to Ukraine from America) even have five-lobe leaves.