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Annual herb from a taproot; stems erect, single, usually branched above, 20-90 cm tall, more or less stiff-hairy with stalked, starlike, and branched hairs.
Basal leaves soon deciduous; stem leaves lanceolate to elliptic, entire, 1.5-7 cm long, 2-20 mm wide, hairy with starlike or branched hairs, unstalked, with ear-like lobes at the base, becoming narrowly oblong-lanceolate and reduced above.
Inflorescence much elongating in fruit; flower stalks slender, 6-10 mm long, ascending, straight; petals light yellow, 2-2.5 mm long; sepals greenish, 1.2-2 mm long, glabrous or short-hairy.
Silicles, almost spherical, about 2 mm long, slightly broader, only slightly compressed, walls hardened, conspicuously wrinkled, glabrous; beaks 0.7-1 mm long, persistent or deciduous.
Source: The Illustrated Flora of British Columbia