Eriogonum umbellatumTorr.

sulfur buckwheat

WFO wfo-0000675570 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Eriogonum umbellatum, photographed by Cecelia Alexander
fig. a Cecelia Alexander, CC0 1.0 / 2022-06-11 / obs. 205542191
Eriogonum umbellatum, photographed by Amthinkia
fig. b Amthinkia, CC0 1.0 / obs. 204554165
Eriogonum umbellatum, photographed by Rachel MacDonald
fig. c Rachel MacDonald, CC0 1.0 / obs. 204218207
Eriogonum umbellatum, photographed by Robert Webster
fig. d Robert Webster, CC BY-SA 4.0 / obs. 199679006
Eriogonum umbellatum, photographed by James H. Thomas
fig. e James H. Thomas, CC BY 4.0 / obs. 203718155
Eriogonum umbellatum, photographed by Rachel MacDonald
fig. f Rachel MacDonald, CC0 1.0 / obs. 204225446
Eriogonum umbellatum, photographed by Shalana Gray
fig. g Shalana Gray, CC BY 4.0 / obs. 201715160
Eriogonum umbellatum, photographed by Tim Messick
fig. h Tim Messick, CC BY 4.0 / obs. 202751918

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 = 2,890 observations

Peak flowering in Jul, from 2,890 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 67 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.

  • Eriogonum aridum Greene
  • Eriogonum azaleastrum Greene
  • Eriogonum biumbellatum Rydb.
  • Eriogonum cognatum Greene
  • Eriogonum covillei Small
  • Eriogonum croceum Small
  • Eriogonum cupreum Gand.
  • Eriogonum dumosum Greene
  • Eriogonum ellipticum Nutt.
  • Eriogonum ferrissii A.Nelson
  • Eriogonum glaberrimum var. aureum Gand.
  • Eriogonum haussknechtii Dammer
  • Eriogonum latum Small ex Rydb.
  • Eriogonum marginale Gand.
  • Eriogonum minus (I.M.Johnst.) Ewan
  • Eriogonum modocense Greene
  • Eriogonum montanum Howell
  • Eriogonum neglectum Greene
  • Eriogonum polyanthum Benth.
  • Eriogonum polyanthum var. bahiiforme Torr. & A.Gray
  • Eriogonum reclinatum Greene
  • Eriogonum rubidum Gand.
  • Eriogonum rubidum var. frigidum Gand.
  • Eriogonum rydbergii Greene

and 43 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.