Bromus diandrusRoth

great brome

WFO wfo-0000855460 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Bromus diandrus, photographed by John Lyden
fig. a John Lyden, CC BY 4.0 / 2022-06-01 / obs. 202675829
Bromus diandrus, photographed by scolym
fig. b scolym, CC BY 4.0 / obs. 195752752
Bromus diandrus, photographed by Wendy St. John
fig. c Wendy St. John, CC BY-SA 4.0 / obs. 203955278
Bromus diandrus, photographed by scolym
fig. d scolym, CC BY 4.0 / obs. 199193143
Bromus diandrus, photographed by Ashwin Srinivasan
fig. e Ashwin Srinivasan, CC BY 4.0 / obs. 201932742
Bromus diandrus, photographed by Tom Erler
fig. f Tom Erler, CC0 1.0 / obs. 196942054
Bromus diandrus, photographed by laiet17
fig. g laiet17, CC0 1.0 / obs. 192718750
Bromus diandrus, photographed by Rafael Medina
fig. h Rafael Medina, CC BY 4.0 / obs. 194644179

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 = 231 observations

Peak flowering in Apr, from 231 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 45 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.

  • Anisantha diandra (Roth) Tutin
  • Anisantha diandra (Roth) Tutin ex Tzvelev
  • Anisantha gussonei (Parl.) Nevski
  • Anisantha macranthera (Hack. ex Trab.) P.Silva
  • Bromus ambigens Jord.
  • Bromus asperipes Jord.
  • Bromus boraei Jord.
  • Bromus diandrus f. asperipes (Jord.) Soó
  • Bromus diandrus f. boraei (Jord.) Soó
  • Bromus diandrus f. glaber (Willk.) Soó
  • Bromus diandrus f. pilosus (F.Dietr.) Soó
  • Bromus diandrus f. propendens (Jord.) Soó
  • Bromus diandrus var. ambigens (Jord.) Asch. & Graebn.
  • Bromus diandrus var. macrantherus (Hack.) Alcaraz, Garre & Sánchez-Gómez
  • Bromus gussonei Parl.
  • Bromus gussonei var. boraei (Jord.) Fouill.
  • Bromus gussonei var. propendens (Jord.) Fouill.
  • Bromus macrantherus (Hack. ex Trab.) Henriq.
  • Bromus maximus subsp. gussonei (Parl.) Douin
  • Bromus maximus subsp. macrantherus Hack. ex Trab.
  • Bromus maximus subsp. pilosus (F.Dietr.) K.Richt.
  • Bromus maximus var. ambigens (Jord.) Nyman
  • Bromus maximus var. asperipes (Jord.) Nyman
  • Bromus maximus var. glaber Willk.

and 21 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.