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

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.

Illustration Source:  The Illustrated Flora of British Columbia

Synonyms and Alternate Names:
Arnica cascadensis H. St. John