Plants 50–90 cm. Root branched; rootstock stout, dark brown. Lower petioles 10–25 cm; blade broad-triangular or triangular-ovate, 8–15 × 7–15 cm, ternate-1–2-pinnate; lower petiolules 1.5–5.5 cm, lateral pinnae ovate to ovate-lanceolate, 2.5–5 × 1.5–2.5 cm, base oblique; median pinnae ovate or obovate, 3-parted, base cuneate; ultimate segments dentate. Umbels 1–2 cm across; peduncles 4–22 cm; bracts several, subulate, linear or linear-lanceolate, 5–10 × ca. 1 mm; pedicels ca. 3 mm. Petals usually purplish brown, obovate, apex narrowly inflexed, mid-rib conspicuous. Fruit obovoid-oblong or long-ellipsoid, ca. 4 × 2–2.5 mm; ribs narrow-winged; vittae 3 in each furrow. Fl. and fr. Jul–Aug.
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