Arnica cordifoliaHook.

Heart-leaf Arnicaheartleaf arnica

WFO wfo-0000081008 Accepted WFO 2026-06 8 photographs CC0 / CC BY / CC BY-SA

Plate 1 figs. a–h · 8 separate observations

Arnica cordifolia, photographed by Victor Hooper
fig. a Victor Hooper, CC BY 4.0 / 2022-06-13 / obs. 205939571
Arnica cordifolia, photographed by Syd Cannings
fig. b Syd Cannings, CC BY 4.0 / obs. 203749991
Arnica cordifolia, photographed by Old Goat
fig. c Old Goat, CC BY-SA 4.0 / obs. 203726202
Arnica cordifolia, photographed by Josiah Londerée
fig. d Josiah Londerée, CC BY 4.0 / obs. 201375465
Arnica cordifolia, photographed by Josiah Londerée
fig. e Josiah Londerée, CC BY 4.0 / obs. 200828903
Arnica cordifolia, photographed by Josiah Londerée
fig. f Josiah Londerée, CC BY 4.0 / obs. 200644392
Arnica cordifolia, photographed by Shane Johnson
fig. g Shane Johnson, CC0 1.0 / obs. 202482699
Arnica cordifolia, photographed by Shane Johnson
fig. h Shane Johnson, CC0 1.0 / obs. 202472636

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.

Native range 20 botanical countries

Regions where Arnica cordifolia is native: Alberta, Arizona, British Columbia, California, Colorado, Idaho, Manitoba, Michigan, Montana, Nevada, New Mexico, Northwest Territories, Ontario, Oregon, Saskatchewan, South Dakota, Utah, Washington, Wyoming, Yukon AlbertaArizonaBritish ColumbiaCaliforniaColoradoIdahoManitobaMichiganMontanaNevadaNew MexicoNorthwest TerritoriesOntarioOregonSaskatchewanSouth DakotaUtahWashingtonWyomingYukon
Native distribution of Arnica cordifolia, after Kew’s World Checklist of Vascular Plants. Introduced, extinct and doubtful records are excluded, so this is where the plant is from, not everywhere it now grows.
RegionTDWG codeContinent
Alberta ABT NORTHERN AMERICA
Arizona ARI
British Columbia BRC
California CAL
Colorado COL
Idaho IDA
Manitoba MAN
Michigan MIC
Montana MNT
Nevada NEV
New Mexico NWM
Northwest Territories NWT
Ontario ONT
Oregon ORE
Saskatchewan SAS
South Dakota SDA
Utah UTA
Washington WAS
Wyoming WYO
Yukon YUK

Region boundaries approximated from Natural Earth (public domain) and mapped to TDWG World Geographical Scheme for Recording Plant Distributions (WGSRPD) level-3 botanical countries (Brummitt 2001). Indicative, not the official WGSRPD geometry.

Flowering 643 in flower of 810 examined

Peak flowering in Jun. Each bar is the share of Arnica cordifolia observations in which someone actually recorded the reproductive state and found the plant in flower, not the raw number of flowering records. That distinction matters: people observe plants far more in spring than in winter, so a bare count of flowering records partly measures when people go outside. Dividing by the number examined removes that. 643 of 810 examined observations were in flower, every one of them research grade. The whisker on each bar is a 95% Wilson interval. 6 months have fewer than 5 examined observations, so no proportion is drawn for them. This is still a global aggregate and not a forecast for your garden: the same species flowers on different dates in different hemispheres. Where a species has fewer than 30 flowering records we do not draw this chart at all. Computed from 10.15468/dl.cgje2x.

Also published as 21 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.

  • Arnica abortiva Greene
  • Arnica andersonii Piper
  • Arnica austinae Rydb.
  • Arnica chionophila Greene
  • Arnica cordifolia subsp. cordifolia
  • Arnica cordifolia subsp. genuina Maguire
  • Arnica cordifolia subsp. whitneyi (Fernald) Maguire
  • Arnica cordifolia var. humilis (Rydb.) Maguire
  • Arnica cordifolia var. macrophylla (Nutt.) Maguire
  • Arnica cordifolia var. pumila (Rydb.) Maguire
  • Arnica cordifolia var. whitneyi (Fernald) Maguire
  • Arnica evermannii Greene
  • Arnica hardinae H.St.John
  • Arnica humilis Rydb.
  • Arnica macrophylla Nutt.
  • Arnica microphylla Walp.
  • Arnica paniculata A.Nelson
  • Arnica parviflora Greene
  • Arnica pumila Rydb.
  • Arnica subcordata Greene
  • Arnica whitneyi Fernald

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.
  3. Wikidata. common name (P1843), joined on the World Flora Online identifier (P7715). CC0. Retrieved 2026-07-13.
  4. Kew, World Checklist of Vascular Plants (WCVP v16). native distribution by TDWG level-3 botanical country, and life form. CC BY 3.0. Retrieved 2026-06-04.

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.