Bidens Linnaeus. Beggar-ticks, Bur-marigold.
A genus of about 240 species, herbs, cosmopolitan. Recent molecular studies suggest that the relationship between Bidens and Coreopsis is complex, and that changes in taxonomy will be needed to more accurately reflect relationships (Kim et al. 1999; Crawford & Mort 2005).
ID notes:The involucre of phyllaries is subtended by an additional series of bracteal structures, the calyculus. Other, related genera have this feature as well.
Ref: Ballard (1986); Crawford & Mort (2005); Cronquist (1980); Kim et al. (1999); Lipscomb & Smith (1977); Roberts (1985); Sherff & Alexander (1955); Strother & Weedon (2006) In Flora of North America Editorial Committee (2006c). Show full citations.
Hover over a shape, letter, icon, or arrow on the map for definition or see the legend. Data for arrows not developed for genera and families which may have species only occurring outside the flora area.
© Gary P. Fleming | Bidens trichosperma | Original Image ⭷
© Floyd A. Griffith | Bidens mitis | Original Image ⭷
© John Gwaltney | Bidens bipinnata | Original Image ⭷
© Gary P. Fleming | Bidens laevis | Original Image ⭷
© Gary P. Fleming | Bidens discoidea | Original Image ⭷
© Alan M. Cressler | Bidens frondosa | Original Image ⭷
© Richard & Teresa Ware | Bidens alba var. radiata CC-BY-NC, permission granted to NCBG | Original Image ⭷
© Scott Ward | Bidens bipinnata | Original Image ⭷Feedback
See something wrong or missing on about Bidens? Let us know here: (Please include your name and email if at all complicated so we can clarify if needed.)
Cite as...