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Perennial herb from a taproot; stems erect, few, branched above, sparsely to densely grey-woolly, 20-70 cm tall.
Basal leaves narrowly elliptic in outline, mostly 1-4 dm long, long-stalked, pinnately cut with lanceolate, abruptly sharp-pointed, entire or toothed segments, sparsely to densely grey-woolly throughout; stem leaves similar to the basal ones, becoming reduced upwards.
Heads with strap-shaped flowers, mostly 10-60 in a flat- to round-topped inflorescence; involucres 10-16 mm tall, cylindric-bell-shaped; involucral bracts grey, short woolly-hairy or less often more or less glabrous, occasionally glandular bristles near the tips of the inner ones, the outer ones deltoid, the longest less than 1/2 as long as the 7-12 inner ones, these lanceolate, obtuse; ray flowers yellow, 14-30 mm long.
Achenes mostly yellowish or brownish, 5.5-9 mm long, slender, weakly to strongly ribbed, narrowed above; pappus white, of hairlike bristles.
This "species" consists of a group of polyploid apomicts which combine the characters of C. occidentalis and either C. acuminata Nutt. or C. pleurocarpa A. Gray.
Source: The Illustrated Flora of British Columbia