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Annual aromatic herbs from a fibrous root; stems erect, simple, branched, glabrous, 8-20 cm tall.
Basal leaves soon deciduous; stems leaves alternate, 1-3 times divided into short, linear-threadlike segments, 2-6 cm long, glabrous.
Heads with ray and disk flowers, several, mostly terminal on the upper branches; involucres 2.5-3 mm tall; involucral bracts subequal, mostly oblong, obtuse or rounded at the tips, with a broad, papery margin; ray flowers white, 10-22, 4-10 mm long; disk flowers yellow, many, about 1 mm long, 5-toothed; receptacles narrowly conic, 3.5-4 mm tall.
Achenes asymmetric, 1.5-2 mm long, smooth except for 5 narrow, winglike ribs; pappus lacking or sometimes a minute, short crown.
Source: The Illustrated Flora of British Columbia