Bidens cernua

Bidens cernua is a plant species in the sunflower family, widespread across much of Eurasia and North America.[4][5][6][7] It is commonly called nodding beggarticks[8] or nodding bur-marigold,[9]

Bidens cernua
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Bidens
Species:
B. cernua
Binomial name
Bidens cernua
Synonyms[1][2][3]
  • Bidens ciliolata Greene
  • Bidens cusickii Greene
  • Bidens dentata (Nutt.) Wiegand
  • Bidens elliptica (Wiegand) Gleason
  • Bidens filamentosa Rydb.
  • Bidens gracilenta Greene
  • Bidens graveolens Komarov 1916 not Mart. 1824
  • Bidens kelloggii Greene
  • Bidens leptomeria Greene
  • Bidens leptopoda Greene
  • Bidens lonchophylla Greene
  • Bidens macounii Greene
  • Bidens marginata Greene 1901 not Perr ex DC. 1836
  • Bidens minima Huds.
  • Bidens prionophylla Greene
  • Bidens quadriaristata var. dentata Nutt.
  • Bidens tripartita var. minima Huds.
  • Bidens venosa Gardner
  • Buphthalmum nutans Vitman
  • Coreopsis bidens L.
  • Coreopsis quadricornis Krock.
  • Coreopsis ridens Gunnerus

Bidens cernua sometimes grows as high as 400 cm (160 inches) tall in favorable conditions. The leaves are sessile with coarsely-toothed margins. The name "cernua" means "nodding", or "hanging". This refers to the fact that the flower heads are sometimes oriented horizontally or downwards. The plant does best in wet habitats such as swamps, marshes, and flood plains.[4]

The seeds can be eaten by ducks.[10]

  • 1796 illustration[11]
  • Herbarium specimen collected in Germany

References
  1. "The Plant List: A Working List of All Plant Species".
  2. "IPNI entry for Coreopsis ridens".
  3. "IPNI entry for Bidens venosa".
  4. Flora of North America, Bidens cernua Linnaeus, Sp. Pl. 2: 832. 1753.
  5. Flora of China, 柳叶鬼针草 liu ye gui zhen cao, Bidens cernua Linnaeus, Sp. Pl. 2: 832. 1753
  6. Biota of North America Program 2014 county distribution map
  7. Altervista Flora Italiana, Forbicina intera, Bidens cernua L. includes photos and European distribution map
  8. Voss, E.G. (1996). Michigan Flora: A guide to the identification and occurrence of the native and naturalized seed-plants of the state. Part III: Dicots (Pyrolaceae–Compositae). Bulletin 61. Ann Arbor, Michigan, U.S.A.: Cranbrook Institute of Science and University of Michigan Herbarium.
  9. "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-01-25. Retrieved 2014-10-17.
  10. Niering, William A.; Olmstead, Nancy C. (1985) [1979]. The Audubon Society Field Guide to North American Wildflowers, Eastern Region. Knopf. p. 369. ISBN 0-394-50432-1.
  11. Figure from Deutschlands Flora in Abbldungen by Johann Georg Sturm, artist: Jacob Sturm)
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