Perennial herb; stems striate, 3-9 dm tall; leaves 3-times pinnately divided (fern-like), 5-20 cm long and 4-15 cm wide, leaflets pinnately lobed or parted into linear-oblong to ovate divisions; inflorescence a compound umbel terminating each stem, primary branches (rays) 2-6 cm long; flower clusters subtended by linear-lanceolate bractlets 3-11 mm long; pedicels 2-6 mm long; flowers yellow; fruit oblong, glabrous, 5-9 mm long, the lateral ribs narrowly winged. Flowers April to August.