Plants 80–100(–200) cm. Stem much-branched, erect, weakly erect or scrambling, lower parts tinged purple when young, becoming deep purplish-red throughout. Basal leaves ovate in outline, 18–40 × 8–25 cm, 2–3-pinnate; ultimate segments long-ovate or ovate-lanceolate, 1.2–6 × 0.5–2 cm, petiolulate, base rounded to cuneate, irregularly serrate, acuminate to long-acuminate. Umbels diffusely branched, 5–15 cm across; rays 6–12(–16), very unequal, 0.5–5.5 cm; umbellules 5–14-flowered; pedicels filiform, 3–8 mm, unequal. Fruit ovoid-ellipsoid or ellipsoid, 5–6.5(–7.5) × 3.5–5(–6) mm, glabrous, reddish brown when mature; dorsal ribs obscure, lateral wings broad, subcorky, 1.2–2 mm wide, margin incurved. Fl. Aug–Sep, fr. Sep–Oct.
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