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Bidens beckii : ウィキペディア英語版 | Bidens beckii
''Bidens beckii'' (Beck's water-marigold) is a species of flowering plant in the daisy family. It is native to Canada and the northern United States.〔(Biota of North America Program 2014 county distribution map )〕〔Scoggan, H. J. 1979. Dicotyledoneae (Loasaceae to Compositae). Part 4. 1117–1711 pp. In Flora of Canada. National Museums of Canada, Ottawa〕〔Roberts, M. L. 1985. The cytology, biology and systematics of ''Megalodonta beckii'' (Compositae). Aquat. Bot. 21: 99–110.〕 ''Bidens beckii'' is an annual herb sometimes as much as to 200 cm (80 inches) tall. It produces numerous yellow flower heads containing both disc florets and ray florets. It grows emerging from stagnant or slow-moving water, with some of the leaves completely under water.〔(Flora of North America, ''Bidens beckii'' Torr. ex Spreng. )〕 ==References==
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