Bidens beckii, commonly called Beck's water-marigold or simply water marigold[ 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.]
Description
Bidens beckii is a
perennial herb sometimes as much as to 200 cm (80 inches) tall;
it grows emerging from stagnant or slow-moving water, the submerged leaves are finely filiform-dissected. The stem typically arises 15 cm above the water and its leaves are simple, oppositely arranged, lanceolate to ovate and serrated and borne directly from the stem with no petiole.
[ Flora of North America, Bidens beckii Torr. ex Spreng.] It produces numerous yellow
flower heads containing (10-30)
and (8)
ray florets in late summer. The flowers are solitary at the end of the stem and 2–2.5 cm in diameter. Below the flower there are 5-8 hairless bracts which are about half as long as the petals.
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