Erigeron coulteri (large mountain fleabane)

Plate 1 figs. a–h · 8 separate observations

Erigeron coulteri, photographed by Diego Blanco — fig. a Diego Blanco, CC0 1.0 / 2021-08-11 / obs. 154791044

Erigeron coulteri, photographed by My-Lan Le — fig. b My-Lan Le, CC BY 4.0 / obs. 148754862

Erigeron coulteri, photographed by Steve Woodward — fig. c Steve Woodward, CC0 1.0 / obs. 138625834

Erigeron coulteri, photographed by Miguel Vieira — fig. d Miguel Vieira, CC BY 4.0 / obs. 88785243

Erigeron coulteri, photographed by Christine Rudman — fig. e Christine Rudman, CC0 1.0 / obs. 86442466

Erigeron coulteri, photographed by Matt Berger — fig. f Matt Berger, CC BY 4.0 / obs. 52986841

Erigeron coulteri, photographed by Cecelia Alexander — fig. g Cecelia Alexander, CC0 1.0 / obs. 20528793

Erigeron coulteri, photographed by Barbara Banfield — fig. h Barbara Banfield, CC BY 4.0 / obs. 1027464

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.

Where it actually grows measured, from 495 observations

Condition	5th percentile	Median	95th percentile
Coldest month, mean daily low	-18.0 °C	-9.9 °C	-5.7 °C
Warmest month, mean daily high	19.2 °C	22.4 °C	26.5 °C
Annual rainfall	753 mm	1,122 mm	1,760 mm
Rainfall in the driest quarter	40 mm	67 mm	220 mm

It is found where winters are severely cold. This is not care advice and it is not a forecast. It is a measurement: we sampled the climate at every one of the 495 research-grade observations of Erigeron coulteri that carry a coordinate, and this is the range those places actually span. The 5th and 95th percentiles are used rather than the minimum and maximum, because a single cultivated specimen in a heated conservatory should not widen a tropical plant's range to the Arctic.

This is not a hardiness zone. A USDA zone is the average annual extreme minimum temperature. The figure above is the mean daily minimum of the coldest month, which is a different quantity and is typically far warmer. Reading one as the other would place a plant several zones too warm, so we do not publish a hardiness zone, because we do not have one.

Also published as 3 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.

Erigeron frondeus Greene
Erigeron leucanthemoides Greene
Erigeron lucidus Greene

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.
Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.

We publish what we can source and we say so when we cannot. This page has no care advice and no toxicity claim, because we do not yet have those from a source we can cite. It has no native range either: Kew's checklist does not cover this taxon.