Rudbeckia trilobaL.

brown-eyed Susan

WFO wfo-0000134497 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Rudbeckia triloba, photographed by Jason Swanson
fig. a Jason Swanson, CC0 1.0 / 2021-09-23 / obs. 202057982
Rudbeckia triloba, photographed by Jason Swanson
fig. b Jason Swanson, CC0 1.0 / obs. 165456583
Rudbeckia triloba, photographed by Eric Schmidt
fig. c Eric Schmidt, CC BY 4.0 / obs. 173820311
Rudbeckia triloba, photographed by Alby Penney
fig. d Alby Penney, CC0 1.0 / obs. 157058797
Rudbeckia triloba, photographed by tzeducation
fig. e tzeducation, CC BY 4.0 / obs. 158862142
Rudbeckia triloba, photographed by Jacob Friend
fig. f Jacob Friend, CC0 1.0 / obs. 157463808
Rudbeckia triloba, photographed by Susan Berry
fig. g Susan Berry, CC0 1.0 / obs. 158011541
Rudbeckia triloba, photographed by Tom Lazar
fig. h Tom Lazar, CC0 1.0 / obs. 156533778

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 = 6,011 observations

Peak flowering in Aug, from 6,011 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 8 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.

  • Centrocarpha aristata (Banks ex Pursh) D.Don
  • Centrocarpha triloba Loudon
  • Rudbeckia beadlei Small
  • Rudbeckia biennis Chapm. ex Torr. & A.Gray
  • Rudbeckia pinnatiloba Beadle
  • Rudbeckia rupestris Chick.
  • Rudbeckia scabra Cav.
  • Rudbeckia triloba var. beadlei (Small) Fernald

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.