Plants 1–1.5 m high. Root fibrous. Stem solitary, branched, pubescent. Basal petioles 40–50 cm; leaf blade triangular ovate in outline, 20–28 × 20–25 cm, ternate; lateral leaflets broadly ovate, 12–15 × 12–13 cm, terminal leaflet flabelliform, 16–18 × 19–29 cm, both surfaces sparsely pubescent, base cordate, margin serrulate. Cauline leaves similar to the basal, reduced upward, smaller, 3-lobed. Umbels 9–14 cm wide; bracts 1–3, linear, 1.5–2 cm; rays 17–20, unequal, 4–8 cm, pubescent; bracteoles 5–8, linear, longer than pedicels; umbellule 20–30-flowered. Calyx teeth subulate. Petals white, outer flowers in umbels radiant. Fruit suborbicular, 8–9 × 7–8 mm; vittae 2 in dorsal furrows, 1 in lateral furrows, 2 on commissure, clavate, about 1/2 length of mericarp. Seed face plane. Fl. Jul–Aug, fr. Aug–Sep.
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