Populus fremontiiS.Watson

Frémont Cottonwood

WFO wfo-0000928140 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Populus fremontii, photographed by Alan Rockefeller
fig. a Alan Rockefeller, CC BY 4.0 / 2022-05-18 / obs. 198781503
Populus fremontii, photographed by Robert Webster
fig. b Robert Webster, CC BY-SA 4.0 / obs. 198896756
Populus fremontii, photographed by George Williams
fig. c George Williams, CC BY 4.0 / obs. 184436390
Populus fremontii, photographed by George Williams
fig. d George Williams, CC BY 4.0 / obs. 183852882
Populus fremontii, photographed by Millie Basden
fig. e Millie Basden, CC BY 4.0 / obs. 188407729
Populus fremontii, photographed by Millie Basden
fig. f Millie Basden, CC BY 4.0 / obs. 187683179
Populus fremontii, photographed by Dorothy Johnson
fig. g Dorothy Johnson, CC0 1.0 / obs. 188511816
Populus fremontii, photographed by Alina Martin
fig. h Alina Martin, CC BY 4.0 / obs. 188557475

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 = 166 observations

Peak flowering in Mar, from 166 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 13 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.

  • Populus arizonica Sarg.
  • Populus canadensis var. fremontii Kuntze
  • Populus deltoides var. fremontii (S.Watson) Cronquist
  • Populus deltoides var. mesetae (Eckenw.) Cronquist
  • Populus fremontii subsp. fremontii
  • Populus fremontii var. arizonica (Sarg.) Jeps.
  • Populus fremontii var. fremontii
  • Populus fremontii var. macdougallii (Rose) Jeps.
  • Populus fremontii var. mesetae (Eckenw.) Little
  • Populus fremontii var. pubescens Sarg.
  • Populus fremontii var. thornberii Sarg.
  • Populus fremontii var. toumeyi Sarg.
  • Populus macdougalii Rose

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.