Bidens frondosaL.

Devil's Beggarticks

WFO wfo-0000076245 Accepted WFO 2026-06 7 photographs CC0 / CC BY

Plate 1 figs. a–g

Bidens frondosa, photographed by Elizabete Marchante
fig. a Elizabete Marchante, CC BY 4.0 / 2022-06-03 / obs. 203142772
Bidens frondosa, photographed by Pavel Kacl
fig. b Pavel Kacl, CC BY 4.0 / obs. 199556270
Bidens frondosa, photographed by Cara-Lisa Schloots
fig. c Cara-Lisa Schloots, CC BY 4.0 / obs. 178669845
Bidens frondosa, photographed by Aleksei Baushev
fig. d Aleksei Baushev, CC BY 4.0 / obs. 175279411
Bidens frondosa, photographed by Alexander Agafonov
fig. e Alexander Agafonov, CC BY 4.0 / obs. 168776985
Bidens frondosa, photographed by Dave Richardson
fig. f Dave Richardson, CC BY 4.0 / obs. 183369653
Bidens frondosa, photographed by Joe Potter Butler
fig. g Joe Potter Butler, CC BY 4.0 / obs. 164527256

Every figure is a research-grade observation under CC0, CC BY or CC BY-SA, rehosted with the photographer’s name, the licence and the observation it came from. Photographs under a NonCommercial licence are excluded from this site and are never stored, which costs us a great many pictures and is not negotiable.

Confused withby our own model

These are not lookalikes we guessed at. Each one is a species our identification model genuinely mistook for this plant, and how many times. The error rate is published.

Flowering n = 1,681 observations

Peak flowering in Sep, from 1,681 community-annotated observations worldwide. This is a global aggregate, not a forecast for your garden: the same species flowers on different dates in different hemispheres, and citizen-science records cluster near cities, at weekends, and in spring. Where a species has fewer than 30 annotated records we do not draw this chart at all.

Also published as 10 synonyms

A synonym is not an error. It is a record of botanists disagreeing, in print, about where this plant belongs. Each of these was somebody’s considered answer.

  • Bidens frondosa f. frondosa
  • Bidens frondosa var. anomala Porter ex Fernald
  • Bidens frondosa var. caudata Sherff
  • Bidens frondosa var. frondosa
  • Bidens frondosa var. minor Hook.
  • Bidens frondosa var. pallida (Wiegand) Wiegand
  • Bidens frondosa var. stenodonta Fernald & H.St.John
  • Bidens melanocarpa Wiegand
  • Bidens melanocarpa var. melanocarpa
  • Bidens melanocarpa var. pallida Wiegand

Sourcesevery claim on this page

  1. World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
  2. iNaturalist. photographs and flowering annotations, CC0 / CC BY / CC BY-SA only. per photograph. Retrieved 2026-06-27.

We publish what we can source and we say so when we cannot. This page has no care advice, no toxicity claim and no native range, because we do not yet have those from a source we can cite.