Plants to 1 m tall. Root stout. Stem branching, villous. Basal leaves 2-pinnate; ultimate segments ovate or lanceolate, terminal leaflets rhombic, base with decursive wings, apex acuminate. Cauline leaves reduced upward. Umbels 13–14 cm wide; peduncles up to 25 cm, villous; bracts absent; rays 30–35, puberulent; bracteoles few, linear; flowers more than 20 per umbellule. Calyx teeth triangular. Petals white, outer flowers in umbels radiant. Fruit obovoid, 6–7 × 4–5 mm; vittae solitary in each furrow, 2 on commissure, clavate, more than 1/2 length of mericarp. Seed face plane. Fl. Jul–Aug, fr. Aug–Sep.
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