Bidens pilosaL.

Hairy Beggarticks

WFO wfo-0000115943 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Bidens pilosa, photographed by Greg Tasney
fig. a Greg Tasney, CC BY-SA 4.0 / 2022-05-31 / obs. 202369487
Bidens pilosa, photographed by Pablo Bombín
fig. b Pablo Bombín, CC BY 4.0 / obs. 205459690
Bidens pilosa, photographed by Tony Rebelo
fig. c Tony Rebelo, CC BY-SA 4.0 / obs. 204598622
Bidens pilosa, photographed by Greg Tasney
fig. d Greg Tasney, CC BY-SA 4.0 / obs. 199570671
Bidens pilosa, photographed by Tony Rebelo
fig. e Tony Rebelo, CC BY-SA 4.0 / obs. 200965489
Bidens pilosa, photographed by Tony Rebelo
fig. f Tony Rebelo, CC BY-SA 4.0 / obs. 202271727
Bidens pilosa, photographed by Tony Rebelo
fig. g Tony Rebelo, CC BY-SA 4.0 / obs. 201062669
Bidens pilosa, photographed by Tony Rebelo
fig. h Tony Rebelo, CC BY-SA 4.0 / obs. 204053297

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 = 1,612 observations

Peak flowering in Apr, from 1,612 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 149 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.

  • Acocotli quauhuahuacensis Hernandez
  • Bidens abadiae DC.
  • Bidens abadiae var. abadiae
  • Bidens abadiae var. pilosoides Sherff
  • Bidens abortiva Schumach. & Thonn.
  • Bidens adhaerescens Vell.
  • Bidens africana Klatt
  • Bidens alausensis Kunth
  • Bidens alba var. radiata (Sch.Bip.) R.E.Ballard
  • Bidens alba var. radiata (Sch.Bip.) Ballard ex Melchert
  • Bidens arenaria Gand.
  • Bidens arenicola Gand.
  • Bidens aurantiaca Colenso
  • Bidens barrancae M.E.Jones
  • Bidens bimucronata Turcz.
  • Bidens bonplandii Sch.Bip.
  • Bidens brachycarpa DC.
  • Bidens bullata var. glabrescens Fiori
  • Bidens bullata var. hirta (Jord.) Coste
  • Bidens calcicola Greenm.
  • Bidens californica DC.
  • Bidens cannabina Lam.
  • Bidens caracasana DC.
  • Bidens caucalidea DC.

and 125 more.

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.