Perennial herb from a long, branching rhizome; stems solitary or occasionally a few clustered together, sparsely hairy with multicellular hairs and often glandular, 10-60 cm tall.
Basal leaves heart-shaped, often produced on separate short shoots; stem leaves opposite, 2-3 (sometimes 1 or 4) pairs, larger than the basal ones, heart-shaped, becoming lance-shaped above, glandular to hairy, stalked below, unstalked above, coarsely toothed to entire.
Heads with ray and disk flowers, 1-3, rarely as many as 7, erect, the bases sparsely to densely hairy with long white hairs, often glandular; ray flowers yellow, usually 9-16, with conspicuous teeth; disk flowers yellow, sparsely hairy; involucres 13-22 mm tall, the bracts lanceolate to oblanceolate, gradually to abruptly pointed, sparsely to densely hairy, often glandular, the tips often fringed.
Achenes 4-8 mm long, moderately to densely stiff-hairy, often with stalked glands; pappus white, finely-barbed.
Arnica cordifolia appears to hybridize with A. latifolia throughout most of its range. These plants are intermediate, especially in leaf characters. In the alpine zone of S BC a smaller phase with narrow, more or less heart-shaped leaves and more glandular achenes has been recognized by some taxonomists as var. pumila (Rydb) Maguire.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia
Present from Summer to Fall
Source: The USDA
||Value / Class
Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
of field plots
species was recorded in:
BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in
|AT(27), BAFA(4), BG(3), BWBS(567), CWH(12), ESSF(2270), ICH(484), IDF(966), IMA(3), MH(13), MS(1336), PP(43), SBPS(263), SBS(1349), SWB(113)|
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Arnica cordifolia subsp. genuina Maguire
Arnica cordifolia var. humilis (Rydb.) Maguire
Arnica cordifolia var. pumila (Rydb.) Maguire
Arnica cordifolia var. whitneyi (Fernald) Maguire
Arnica hardinae H. St. John
Arnica humilis Rydb.
Arnica paniculata A. Nelson
Arnica whitneyi Fernald