Plants 60–100 cm tall. Root cylindrical. Stem solitary, branched above. Basal leaves 2-pinnate; pinnae 3–4 pairs, lacerate-pinnatifid, ultimate segments lanceolate, abaxially sparsely puberulent, margins sharply serrate. Cauline leaves gradually reduced upward. Peduncles 7–20 cm; bracts absent; rays 30–50, unequal, 6–12(–20) cm; bracteoles few, linear; umbellules many-flowered. Calyx teeth minute. Petals white, outer flowers in umbels radiant. Fruit suborbicular, 4–6 × 4–5 mm; vittae solitary in each furrow, 2 on commissure, clavate, exceeding 1/2 length of mericarp. Seed face plane. Fl. Jul–Aug, fr. Aug–Sep.
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