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 
| |
| 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 edit
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]
References edit
- ^ 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
- ^ The Plant List, Bidens beckii Torr. ex Spreng.
- ^ USDA, NRCS (n.d.). "Bidens beckii". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 28 May 2015.
- ^ 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.
- ^ 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.
- ^ a b "Bidens beckii (Water Marigold): Minnesota Wildflowers". www.minnesotawildflowers.info. Retrieved 16 June 2016.
- ^ Flora of North America, Bidens beckii Torr. ex Spreng.
External links edit
Media related to Bidens beckii at Wikimedia Commons
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