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Annual, biennial or sometimes perennial scentless herb from a fibrous root; stems erect, simple, branched, glabrous, 5-60 cm tall.
Basal leaves lacking; stems leaves alternate, 1-3 times divided into short, linear-threadlike segments, 2-8 cm long, glabrous; basal leaves deciduous by flowering time.
Heads with ray and disk flowers, several to numerous, mostly terminal on the upper branches; involucres 4-5 mm tall; involucral bracts subequal, mostly oblong, obtuse at the tips, with a broad, papery margin and central, dark, greenish or brownish area; ray flowers white, 10-25, 4-13 mm long; disk flowers yellow, many, about 1 mm long, 5-toothed; receptacles hemispheric, 5-8 mm tall.
Achenes asymmetric, 1.5-2 mm long, with 3 light-coloured, rounded, callous ribs on the inner face, the intervals brown and wrinkled; pappus a minute, toothed crown.
Source: The Illustrated Flora of British Columbia