Grindelia hirsutulaHook. & Arn.

Hairy Gumweed

WFO wfo-0000035575 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Grindelia hirsutula, photographed by joergmlpts
fig. a joergmlpts, CC BY 4.0 / 2022-05-31 / obs. 202331159
Grindelia hirsutula, photographed by Peter Brastow
fig. b Peter Brastow, CC BY 4.0 / obs. 198011043
Grindelia hirsutula, photographed by Nicholas Wei
fig. c Nicholas Wei, CC BY-SA 4.0 / obs. 186140841
Grindelia hirsutula, photographed by Dutza K.
fig. d Dutza K., CC BY 4.0 / obs. 197429067
Grindelia hirsutula, photographed by Trevor Harding
fig. e Trevor Harding, CC BY 4.0 / obs. 145871501
Grindelia hirsutula, photographed by Andrew Lie
fig. f Andrew Lie, CC BY 4.0 / obs. 202365454
Grindelia hirsutula, photographed by joergmlpts
fig. g joergmlpts, CC BY 4.0 / obs. 136633194
Grindelia hirsutula, photographed by Zac Peterson
fig. h Zac Peterson, CC BY 4.0 / obs. 139793844

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 = 605 observations

Peak flowering in May, from 605 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 127 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.

  • Donia glutinosa Hook.
  • Grindelia acutifolia Steyerm.
  • Grindelia arenicola Steyerm.
  • Grindelia arenicola f. arenicola
  • Grindelia arenicola f. trichophora Steyerm.
  • Grindelia arenicola var. arenicola
  • Grindelia arenicola var. pachyphylla Steyerm.
  • Grindelia blakei Steyerm.
  • Grindelia bracteosa J.T.Howell
  • Grindelia brownii A.Heller
  • Grindelia camporum Greene
  • Grindelia camporum f. camporum
  • Grindelia camporum f. foliacea Steyerm.
  • Grindelia camporum var. abbreviata Steyerm.
  • Grindelia camporum var. australis Steyerm.
  • Grindelia camporum var. bracteosa (J.T.Howell) M.A.Lane
  • Grindelia camporum var. davyi (Jeps.) Steyerm.
  • Grindelia camporum var. interioris Steyerm.
  • Grindelia camporum var. parviflora Steyerm.
  • Grindelia collina J.K.Henry
  • Grindelia columbiana Rydb.
  • Grindelia cuneifolia Nutt.
  • Grindelia cuneifolia var. cuneifolia
  • Grindelia cuneifolia var. paludosa (Greene) Jeps.

and 103 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.