Allium cernuumRoth

nodding onion

WFO wfo-0000755924 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Allium cernuum, photographed by Shane Johnson
fig. a Shane Johnson, CC0 1.0 / 2022-06-06 / obs. 204762768
Allium cernuum, photographed by Peter Abrahamsen
fig. b Peter Abrahamsen, CC BY 4.0 / obs. 205337636
Allium cernuum, photographed by Eric Knight
fig. c Eric Knight, CC BY 4.0 / obs. 203950450
Allium cernuum, photographed by Shane Johnson
fig. d Shane Johnson, CC0 1.0 / obs. 204526537
Allium cernuum, photographed by Shane Johnson
fig. e Shane Johnson, CC0 1.0 / obs. 204532357
Allium cernuum, photographed by Shane Johnson
fig. f Shane Johnson, CC0 1.0 / obs. 204680276
Allium cernuum, photographed by Shane Johnson
fig. g Shane Johnson, CC0 1.0 / obs. 204476615
Allium cernuum, photographed by Chuck Wilson
fig. h Chuck Wilson, CC0 1.0 / obs. 203760574

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.

Flowering n = 1,833 observations

Peak flowering in Jul, from 1,833 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 19 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.

  • Allium alatum Schreb. ex Roth
  • Allium allegheniense Small
  • Allium cernuum f. alba J.K.Henry
  • Allium cernuum f. obtusum Cockerell
  • Allium cernuum subsp. neomexicanum (Rydb.) Traub & Ownbey
  • Allium cernuum subsp. obtusum (Cockerell) Traub & Ownbey
  • Allium cernuum var. neomexicanum (Rydb.) J.F.Macbr.
  • Allium cernuum var. obtusum (Cockerell) Cockerell
  • Allium cernuum var. obtusum (Cockerell) Cockerell
  • Allium neomexicanum Rydb.
  • Allium nutans Schult. & Schult.f.
  • Allium oxyphilum Wherry
  • Allium recurvatum Rydb.
  • Allium tricorne Poir.
  • Calliprena cernua (Roth) Salisb.
  • Cepa cernua (Roth) Moench
  • Gynodon cernuus (Roth) Raf.
  • Gynodon elliotii Raf.
  • Gynodon rupestris 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.