Bidens beckii

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Bidens beckii
Bidens beckii drawing 01.png
1913 illustration[1]
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Bidens
B. beckii
Binomial name
Bidens beckii
Torr. ex Spreng.
Range within North America

Megalodonta beckii (Torr. ex Spreng.) Greene

Bidens beckii, commonly called Beck's water-marigold or simply water marigold[3] is a species of flowering plant in the daisy family. It is native to Canada and the northern United States.[4][5][6]


Bidens beckii is a perennial herb sometimes as much as to 200 cm (80 inches) tall;[7] 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.[8][9] It produces numerous yellow flower heads containing (10-30) disc florets 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.[8]

Rural Hours - Beck's Bidens


  1. ^ 1913 illustration from USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 3: 500
  2. ^ The Plant List, Bidens beckii Torr. ex Spreng.
  3. ^ "Bidens beckii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 28 May 2015.
  4. ^ Biota of North America Program 2014 county distribution map
  5. ^ Scoggan, H. J. 1979. Dicotyledoneae (Loasaceae to Compositae). Part 4. 1117–1711 pp. In Flora of Canada. National Museums of Canada, Ottawa
  6. ^ Roberts, M. L. 1985. The cytology, biology and systematics of Megalodonta beckii (Compositae). Aquat. Bot. 21: 99–110.
  7. ^ Rhoads, Ann; Block, Timothy. The Plants of Pennsylvania (2 ed.). Philadelphia Pa: University of Pennsylvania press. ISBN 978-0-8122-4003-0.
  8. ^ a b "Bidens beckii (Water Marigold): Minnesota Wildflowers". Retrieved 16 June 2016.
  9. ^ Flora of North America, Bidens beckii Torr. ex Spreng.

External links[edit]