Sorbus americanaMarshall

American mountain ash

WFO wfo-0001015070 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Sorbus americana, photographed by Ashwin Srinivasan
fig. a Ashwin Srinivasan, CC BY 4.0 / 2021-10-23 / obs. 165615632
Sorbus americana, photographed by Alexis Tinker-Tsavalas
fig. b Alexis Tinker-Tsavalas, CC BY 4.0 / obs. 163506478
Sorbus americana, photographed by C Mo
fig. c C Mo, CC0 1.0 / obs. 163695980
Sorbus americana, photographed by Jeff Clark
fig. d Jeff Clark, CC BY 4.0 / obs. 200631760
Sorbus americana, photographed by Allan Harris
fig. e Allan Harris, CC0 1.0 / obs. 205155240
Sorbus americana, photographed by Alexis Godin
fig. f Alexis Godin, CC BY 4.0 / obs. 202452485
Sorbus americana, photographed by Ian Whyte
fig. g Ian Whyte, CC0 1.0 / obs. 172594663
Sorbus americana, photographed by Will Kuhn
fig. h Will Kuhn, CC BY 4.0 / obs. 160386837

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 = 185 observations

Peak flowering in Jun, from 185 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 20 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.

  • Aucuparia americana (Marshall) Nieuwl.
  • Crataegus americana (Marshall) Chalon
  • Pyrus americana (Marshall) Spreng.
  • Pyrus americana (Marshall) DC.
  • Pyrus americana subsp. microcarpa (Pursh) Juel, Cedergr. & Örtendahl
  • Pyrus americana var. microcarpa (Pursh) Torr. & A.Gray
  • Pyrus microcarpa (Pursh) DC.
  • Pyrus microcarpa (Pursh) Spreng.
  • Sorbus americana Willd.
  • Sorbus americana subsp. microcarpa (Pursh) Juel, Cedergr. & Örtendahl
  • Sorbus americana var. macrocarpa Zabel
  • Sorbus americana var. micrantha (Dum.Cours.) K.Koch
  • Sorbus americana var. microcarpa (Pursh) Wenz.
  • Sorbus aucuparia Michx.
  • Sorbus aucuparia var. americana (Marshall) Pers.
  • Sorbus humifusa S.Watson
  • Sorbus micrantha Dum.Cours.
  • Sorbus microcarpa Pursh
  • Sorbus pumila Raf.
  • Sorbus riparia Raf.

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.