Bidens beckii

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

Bidens beckii
1913 illustration[1]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Bidens
Species:
B. beckii
Binomial name
Bidens beckii
Torr. ex Spreng.
Range within North America
Synonyms[2]

Megalodonta beckii (Torr. ex Spreng.) Greene

Description

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

References
  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. USDA, NRCS (n.d.). "Bidens beckii". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. 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 (5 September 2007). The Plants of Pennsylvania (2 ed.). Philadelphia Pa: University of Pennsylvania press. ISBN 978-0-8122-4003-0.
  8. "Bidens beckii (Water Marigold): Minnesota Wildflowers". www.minnesotawildflowers.info. Retrieved 16 June 2016.
  9. Flora of North America, Bidens beckii Torr. ex Spreng.

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