Plants 80–150 cm. Roots 5–15 × 0.6–1.5 cm. Stem striate, lower parts purple-brown. Leaves broadly ovate-triangular in outline, 15–25 × 12–20 cm; petiole 6–20 cm, stout; pinnae 5–6 pairs, remote; ultimate segments ovate-oblong to linear-lanceolate, 20–60 × 3–10 mm. Umbels 3–14 cm across; peduncles 5–18 cm, stout; bracts usually absent, occasionally 1–2, 2–5 mm, membranous; rays 5–15, 2–9 cm, unequal; umbellules 14–20-flowered; pedicels 5–14 mm, unequal. Petals ca. 1.5 × 1 mm. Fruit ovoid, 4–7 × 2–3.5 mm, chocolate-brown; ribs pale brown. Seed face deeply concave. Fl. Jul–Aug, fr. Sep–Oct.
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