E-Flora BC: Electronic Atlas of the Flora of British Columbia

Arnica mollis Hook.
hairy arnica
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jim Riley  Email the photographer   (Photo ID #8880)

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Distribution of Arnica mollis
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Species Information

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General:
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.
Leaves:
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.
Flowers:
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.
Fruits:
Achenes 5.0-7.5 mm long, usually moderately hairy and sometimes glandular; pappus brownish, more or less feathery.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Yellow
Blooming Period:
Summer
Fruit/Seed characteristics:
Colour: Brown
Present over the Fall
Source:  The USDA

Habitat / Range

Moist to mesic meadows and open forests in the lowland to alpine zones; common in S BC, less frequent northward; N to AK, YT and NT, E to AB and S to CO, UT and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Arnica mollis

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class

Minimum

Average

Maximum

Elevation (metres) 81 1862 2562
Slope Gradient (%) 0 22 110
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 179 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 4 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
250
Modal BEC Zone Class
ESSF
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)

Climate

The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is montane boreal & cool temperate.

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

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References