Eutrochium purpureum(L.) E.E.Lamont

sweet Joe-Pye-weed

WFO wfo-0000077471 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Eutrochium purpureum, photographed by Ryan Sorrells
fig. a Ryan Sorrells, CC BY 4.0 / 2022-04-25 / obs. 191161740
Eutrochium purpureum, photographed by Mac Post
fig. b Mac Post, CC BY 4.0 / obs. 155374545
Eutrochium purpureum, photographed by Jason Swanson
fig. c Jason Swanson, CC0 1.0 / obs. 165449977
Eutrochium purpureum, photographed by Jason Swanson
fig. d Jason Swanson, CC0 1.0 / obs. 154650236
Eutrochium purpureum, photographed by Tom Lazar
fig. e Tom Lazar, CC0 1.0 / obs. 159632563
Eutrochium purpureum, photographed by Ryan Sorrells
fig. f Ryan Sorrells, CC BY 4.0 / obs. 153602027
Eutrochium purpureum, photographed by Yann Kemper
fig. g Yann Kemper, CC0 1.0 / obs. 151745465
Eutrochium purpureum, photographed by Bob
fig. h Bob, CC BY 4.0 / obs. 146725224

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 = 596 observations

Peak flowering in Aug, from 596 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 16 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.

  • Cunigunda purpurea (L.) Lunell
  • Eupatorium falcatum Michx.
  • Eupatorium maculatum var. amoenum (Pursh) Britton
  • Eupatorium purpureum f. amoenum (Pursh) Voss
  • Eupatorium purpureum f. falcatum (Michx.) Voss
  • Eupatorium purpureum f. purpureum
  • Eupatorium purpureum subsp. purpureum
  • Eupatorium purpureum var. album Barratt ex Alph.Wood
  • Eupatorium purpureum var. amoenum (Pursh) A.Gray
  • Eupatorium purpureum var. falcatum (Michx.) Britton
  • Eupatorium purpureum var. holzingeri (Rydb.) E.E.Lamont
  • Eupatorium purpureum var. ovatum Alph.Wood
  • Eupatorium purpureum var. purpureum
  • Eupatorium purpureum var. verticillatum Alph.Wood
  • Eupatorium trifoliatum Stev.
  • Eupatorium trifoliatum var. amoenum Farw.

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.