Iris douglasiana (Douglas iris)

Plate 1 figs. a–h

Iris douglasiana, photographed by P Holroyd — fig. a P Holroyd, CC BY 4.0 / 2022-05-29 / obs. 201993934

Iris douglasiana, photographed by Chuck Wilson — fig. b Chuck Wilson, CC0 1.0 / obs. 194962847

Iris douglasiana, photographed by Rebecca Johnson — fig. c Rebecca Johnson, CC BY 4.0 / obs. 203669250

Iris douglasiana, photographed by Henrik Kibak — fig. d Henrik Kibak, CC BY 4.0 / obs. 194872037

Iris douglasiana, photographed by Alexander Wentworth — fig. e Alexander Wentworth, CC BY 4.0 / obs. 204535252

Iris douglasiana, photographed by Dorothy Johnson — fig. f Dorothy Johnson, CC0 1.0 / obs. 198863082

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 = 1,520 observations

273

591

420

Flowering observations of Iris douglasiana by month
Month	Observations
Jan	26
Feb	79
Mar	273
Apr	591
May	420
Jun	95
Jul	21
Aug	2
Sep	0
Oct	1
Nov	5
Dec	7

Peak flowering in Apr, from 1,520 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 12 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.

Iris beecheyana Herb.
Iris douglasiana f. alpha (Dykes) R.C.Foster
Iris douglasiana var. alpha Dykes
Iris douglasiana var. altissima Purdy ex Jeps.
Iris douglasiana var. beecheyana (Herb.) Baker
Iris douglasiana var. bracteata Herb.
Iris douglasiana var. major Torr.
Iris douglasiana var. mendocinensis Eastw.
Iris douglasiana var. nuda Herb.
Iris douglasiana var. oregonensis R.C.Foster
Iris watsoniana Purdy
Limniris douglasiana (Herb.) Rodion.

Sourcesevery claim on this page

World Flora Online Plant List. accepted name, authority, classification. CC0. Retrieved 2026-07-12.
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.