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Annual herb from slender taproot; stems usually solitary, stiff, 5-30 cm tall, usually glabrous.
Basal leaves in compact rosettes, compound, stalked, hairy-fringed, pinnate with 2-3 or more pairs of egg-shaped to orbicular leaflets and a larger, somewhat kidney-shaped terminal leaflet; stem leaves few, almost unstalked, with smaller, narrower leaflets; all leaflets wavy-margined to shallowly few-lobed, sparsely stiff-hairy above and on the margins.
Inflorescence a simple raceme; flower stalks ascending, 5-10 mm long; petals white, narrow, 1.5-2 mm long; sepals half as long as petals, greenish-violet with narrow white margins; stamens 4.
Siliques, erect, 1.8-2.5 cm long, about 1 mm wide; styles 0.5-2 (6) mm long; seeds 22-36.
Source: The Illustrated Flora of British Columbia