Rhododendron occidentale(Torr. & A.Gray) A.Gray

western azalea

WFO wfo-0001047077 Accepted WFO 2026-06 8 photographs CC0 / CC BY

Plate 1 figs. a–h

Rhododendron occidentale, photographed by Mike Heine
fig. a Mike Heine, CC BY 4.0 / 2022-05-21 / obs. 199425154
Rhododendron occidentale, photographed by Diego Blanco
fig. b Diego Blanco, CC0 1.0 / obs. 148909271
Rhododendron occidentale, photographed by joergmlpts
fig. c joergmlpts, CC BY 4.0 / obs. 194855444
Rhododendron occidentale, photographed by Drew Meyer
fig. d Drew Meyer, CC0 1.0 / obs. 152086647
Rhododendron occidentale, photographed by Michael Warner
fig. e Michael Warner, CC BY 4.0 / obs. 142384985
Rhododendron occidentale, photographed by Madeleine Claire
fig. f Madeleine Claire, CC BY 4.0 / obs. 139688077
Rhododendron occidentale, photographed by Adam J. Searcy
fig. g Adam J. Searcy, CC BY 4.0 / obs. 139753342
Rhododendron occidentale, photographed by Zac Peterson
fig. h Zac Peterson, CC BY 4.0 / obs. 145345207

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 = 978 observations

Peak flowering in Jun, from 978 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 6 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.

  • Azalea californica Torr. & A.Gray ex Durand
  • Azalea occidentalis Torr. & A.Gray
  • Rhododendron occidentale var. californicum (Torr. & A.Gray ex Durand) Hrusa
  • Rhododendron occidentale var. paludosum Jeps.
  • Rhododendron occidentale var. sonomense (Greene) Rehder
  • Rhododendron sonomense Greene

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.