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

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]

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. 1 2 "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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