Slender, woody-based herb 6-40 dm. tall, glabrous except for the puberulent inflorescence; leaves oblong-ovate to ovate-deltoid, the blade 8-20 cm. long, 2- 3-ternate, the leaflets oblong-ovate, 2-8 cm. long, 1-3.5 cm. broad, doubly serrate and often incised, the petiole 8-16 cm. long; cauline leaves reduced upward; peduncles slender, 1-3 dm. long; involucre usually wanting, the involucel of several conspicuous bractlets exceeding the flowers and often the fruit; fertile rays usually 3-8, unequal, spreading, 3-9 cm. long, the fertile pedicels 5-10, 3-12 mm. long; flowers purple or greenish-yellow; stylopodium low-conical, the carpophore parted; fruit oblong to oblong-oval, 4-7 mm. long, 2-4 mm. broad, the ribs acute.