Coarse plant,
2-12 dm tall, single-stemmed from a well-developed, bitter, taproot; leaf blades
5-15 cm long, 2-7 cm wide; ultimate segments linear to lanceolate, 2-12 mm long
and 0.5-2 mm wide; upper leaves may have leaves more elongate; involucre bracts
usually pinnatifid; bractlets of involucel mostly linear and entire; flowers
white or yellowish; outer rays or the umbel are narrower in fruit than in
flower, the outer rays longer and arching inward; fruit ovoid 3-4 mm long, 2 mm
broad; roadsides, disturbed areas, moist open spots.