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

Arnica rydbergii Greene
Rydberg's arnica
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #14074)

E-Flora BC Static Map
Distribution of Arnica rydbergii
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Species Information

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Perennial herb from a scaly, short-branched rhizome; stems solitary to clustered, erect, sometimes branched above, moderately to densely hairy, 10-30 cm tall.
Basal leaves similar to the stem leaves, often produced on separate shoots, stalked; stem leaves 3-4 pairs (rarely 2 or 5 pairs), opposite, lanceolate to oblanceolate or egg-shaped, 3-10 cm long, 0.5-2.5 cm wide, reduced above, glabrate to glandular and hairy, short-stalked below, unstalked above, entire to coarsely toothed.
Heads with ray and disk flowers, 1-3 (rarely 5), usually erect, the bases sparsely to densely hairy and usually with short-stalked glands; involucres 9-15 mm tall; involucral bracts linear-lanceolate to lanceolate, glandular and nearly glabrous to sparsely hairy and fringed on the margins; ray flowers yellow, usually 7-10, inconspicuously toothed or rarely entire; disk flowers yellow.
Achenes 5.5-6.5 mm long, densely short-hairy throughout; pappus white, finely-barbed.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to dry meadows and rocky slopes in the alpine zone; common in BC south of 55degreeN; E to AB and S to CO, UT and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Arnica rydbergii

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) 850 2177 2619
Slope Gradient (%) 0 33 82
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
25 166 355
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: AT(21), ESSF(26), IMA(3), PP(1)


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 cascadensis H. St. John

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References