Plants perennial, 60–100(–150) cm. Root stout, yellow-brown, 10–20 × 1.5–2.5 cm. Stem thinly ribbed, glabrous. Leaves petiolate, petioles 9–20 cm, sheaths 4–6 cm, narrowly oblong; blade triangular-ovate, 15–18(–25) × 13–15(–22) cm, 1–2-ternate-pinnate; leaflets sessile, lanceolate to oblong-lanceolate, 4–7 × 1.5–3 cm, base cuneate slightly decurrent, margin irregularly deep-serrate, hispid along midribs. Umbels 7–15 cm across; peduncles, rays and pedicels hispidulous; peduncles 7–15 cm; bracts 3–7, linear-lanceolate, ciliate; rays 20–32; bracteoles 6–10, linear, slightly shorter than pedicels, ciliate; umbellules 13–22-flowered. Calyx teeth obsolete. Petals white, ovate, notched. Fruit narrow-oblong, 5–9 × 2.5–4 mm; dorsal ribs protruding, acute, lateral ribs winged, wings slightly narrower than the body; vittae 1–2 in each furrow, 3–6 on commissure. Fl. May–Jul, fr. Jun–Aug.
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