Perennial herb from a freely rooted rhizome; stems solitary, sometimes branched above, sparsely to densely hairy with multicellular hairs, sometimes also glandular, 15-65 cm tall.
Basal leaves elliptic, smaller than the stem leaves, often produced on separate shoots, often deciduous by flowering time; stem leaves 2-4 pairs, opposite, lanceolate to oblanceolate or elliptic, 2-20 cm long, 0.5-2.5 cm wide, reduced above, glabrous to glandular and hairy, stalked below, unstalked above, entire to coarsely toothed.
Heads with ray and disk flowers, 1-5, usually erect, the bases hairy and glandular; involucres 10-18 mm tall; involucral bracts lanceolate to oblanceolate, hairy, and with stalked glands; ray flowers yellow, 14-20, short-toothed at the tips; disk flowers yellow.
Achenes 5.0-7.5 mm long, usually moderately hairy and sometimes glandular; pappus brownish, more or less feathery.
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 over the 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(33), BAFA(2), ESSF(161), ICH(1), IDF(1), IMA(9), MH(4), MS(3), SBS(3), SWB(6)|
Source: Klinkenberg 2013
Synonyms and Alternate Names:
Arnica amplexicaulis subsp. genuina Maguire
Arnica amplexicaulis subsp. prima (Maguire) Maguire
Arnica amplexicaulis var. piperi H. St. John & Warren
Arnica amplexicaulis var. prima (Maguire) B. Boivin
Arnica amplexifolia Rydb.
Arnica mollis var. aspera (Greene) B. Boivin
Arnica mollis var. silvatica (Greene) Maguire