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General: Perennial herb, from an ascending, fibrous-rooted rhizome or stem-base; stems leafy, erect or sometimes ascending, simple or branched only in the inflorescence, sparsely to densely hairy or sometimes glandular at least in the upper portion, 10-50 cm tall.
Basal leaves lance-shaped to narrowly elliptic, hairy and often glandular, stalked, entire to toothed; stem leaves opposite, 2-4 pairs (rarely 1 or 5), reduced and becoming unstalked and entire upwards.
Heads with ray and disk flowers, solitary to 5 (rarely 7), the bases densely white-hairy; involucres 10-18 mm tall; involucral bracts lance-shaped, hairy, and usually glandular; ray flowers yellow, 10-16, toothed at the apex; disk flowers yellow.
Achenes 4-8 mm long, uniformly densely hairy and often glandular; pappus white, finely-barbed.
Four subspecies occur in BC.
1. Plants and involucres conspicuously white, woolly long-hairy; stems 5-20 cm tall, common in the alpine zone throughout BC east of the Coast-Cascade Mountains.................... ssp. tomentosa (Macoun) G. W. Dougl. & G. Ruyle-Dougl.
1. Plants and involucres never conspicuously white, woolly long-hairy; stems 10-50 cm tall, frequent in N and E BC.
2. Leaves regularly toothed (at least the basal ones), lower leaves long-stalked; stems 20-45 cm tall, frequent in the montane zone of the Rocky Mountains of NE and SE BC.................. ssp. lonchophylla (Greene) G.W. Dougl.& G. Ruyle-Dougl.
2. Leaves entire or sometimes irregularly toothed, lower leaves short-stalked; stems 10-45 cm tall, plants of the montane and lower subalpine zones of N BC.
3. Heads solitary (rarely 3); stem leaves 2-3 pairs; stems 10-25 (rarely 30) cm tall..................... ssp. Angustifolia
3. Heads 3-5 (rarely 1 or 7), stem leaves 4-5 pairs (rarely 3 pairs); stems 15-45 cm tall.................... ssp. attenuata (Greene) G.W. Dougl. & G. Ruyle-Dougl.
Source: The Illustrated Flora of British Columbia