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
Click here to view the full interactive map and legend
Details about map content are available here
Click on the map dots to view record details.

Species Information

Click on the image below to view an expanded illustration for this species.



General:
Perennial herb from a scaly, short-branched rhizome; stems solitary to clustered, erect, sometimes branched above, moderately to densely hairy, 10-30 cm tall.
Leaves:
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.
Flowers:
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.
Fruits:
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

Ecology

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

Minimum

Average

Maximum

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
Class
C
Number of field plots
 species was recorded in:
51
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: AT(21), ESSF(26), IMA(3), PP(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 cascadensis H. St. John

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References