Arnica longifolia D.C. Eaton
seep-spring arnica (spearleaf arnica)
Asteraceae (Aster family)

Introduction to Vascular Plants


© Ryan Batten     (Photo ID #66832)


E-Flora BC Static Map

Distribution of Arnica longifolia
Click here to view the full interactive map and legend

Species Information

Perennial herb from a short rhizome or branched base; stems leafy, erect, numerous, sometimes branched above, glabrate below, sparsely hairy above, 30-60 cm tall.
Basal leaves poorly developed, often deciduous by flowering time; stem leaves opposite, unstalked to shortly stalked, usually 5-7 (sometimes 4) pairs, linear-lanceolate to lance-elliptic, entire or sometimes inconspicuously toothed, 5-15 cm long, 1.0-3.5 cm wide, short-hairy to sparsely glandular.
Heads with ray and disk flowers, 7-20 (rarely as few as 3 or as many as 35), the bases sparsely to moderate hairy and often with dense, stalked glands; involucres 7-12 mm tall; involucral bracts linear-lanceolate to oblanceolate, hairy; ray flowers yellow, 8-13, conspicuously or inconspicuously toothed; disk flowers yellow.
Achenes 4.5-5.5 mm long, subglabrate or with some short-stalked glands; pappus brownish, more or less feathery.

SourceThe Illustrated Flora of British Columbia


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.

USDA Species Characteristics

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


Ecological Framework for Arnica longifolia

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




Elevation (metres)
1580 1400 1760
Slope Gradient (%)
20 20 20

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

57 20 95
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 4 6
Modal Nutrient Regime
# of field plots
 species was recorded in:
Modal BEC Zone Class

All BEC Zones (# of stations/zone) species was recorded in


Habitat and Range

Moist to wet meadows and seepage slopes in subalpine and alpine zones; rare in SC BC, known only from Snowy Mountain; E to SW AB and S to CO and CA.

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Arnica longifolia subsp. genuina Maguire
Arnica longifolia subsp. myriadenia (Piper) Maguire