Biennials or perennials; sparsely to densely pilose. Stems usually branched distally, rarely basally, (2.5-)4-10(-15) dm. Basal leaves: petiole (1-)2-10(-15) cm; blade lanceolate, 10-45 cm, margins coarsely dentate or pinnatifid, lateral lobes oblong or lanceolate, (terminal lobe deltate or lanceolate, larger than lateral lobes). Cauline leaves: (distalmost) blade lanceolate or sublinear. Fruiting pedicels divaricate, straight, 1-2(-2.3) cm. Flowers: sepals spreading, 2.5-4 × 1-1.5 mm; petals (4-)4.5-7(-8) × (2-)3-5 mm, claw (slender), 1-2 mm; filaments 1.5-3.5 mm; anthers 0.8-1 mm. Fruits ovoid, or, rarely, suboblong and slightly constricted at middle, terete, not winged, 1- or 2-loculed, (0.5-)0.6-0.7(-0.8) cm × 3-4(-5) mm, (gradually tapering to apex); style obsolete or, rarely, to 1 mm. Seeds 1 or 2 per fruit, 2-3.5 mm. 2n = 14. Flowering Jun-Aug. Roadsides, fields, pastures, meadows, disturbed areas, waste places; introduced; B.C., N.B., N.S., Que.; Mass., Mich., N.Y, Ohio, Pa.; Europe; Asia.