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

Arnica louiseana Farr
Lake Louise arnica
Asteraceae (Aster family)

Introduction to Vascular Plants

© Ryan Batten  Email the photographer   (Photo ID #25786)

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Distribution of Arnica louiseana
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Species Information

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General:
Perennial herb from a short, branched stem-base; stems erect or ascending, solitary or occasionally a few clustered together, rarely branched above. sparsely long-hairy with multicellular hairs and sometimes glandular, 5-25 cm tall
Leaves:
Basal leaves lanceolate to oblanceolate, 3-5 nerved, glabrous to long-hairy, short to long-stalked, 1-6 cm long; stem leaves 1-4 pairs (rarely absent), the blades lanceolate to oblanceolate, 1.5-7 cm long, 0.4-2.0 cm wide, usually toothed, glabrous to long-hairy, unstalked or short-stalked.
Flowers:
Heads with ray and disk flowers, solitary (rarely 3), usually nodding, the bases long-hairy with yellow hairs; involucres 10-18 mm tall; involucral bracts lanceolate, with short-stalked glands, the tips fringed; ray flowers yellow, 9-15, with conspicuous teeth; disk flowers yellow.
Fruits:
Achenes stiff-hairy and moderately glandular, 4-6 mm long; pappus white, finely-barbed.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry meadows and rocky slopes in the alpine zone; rare in SE BC, known only from Kootenay National Park; E to SW AB.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Arnica louiseana

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) 1760 2210 2450
Slope Gradient (%) 22 41 54
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
180 225 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 2 4
Modal Nutrient Regime
Class
Number of field plots
 species was recorded in:
3
Modal BEC Zone Class
AT
All BEC Zones (# of stations/zone) species was recorded in: AT(1), IMA(1)

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 not evaluated, unknown or variable.

Synonyms and Alternate Names

Arnica louiseana subsp. griscomii (Fernald) Maguire
Arnica louiseana var. genuina Maguire

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References