Plants perennial, 50–100 cm. Root conic, brown, ca. 10 cm. Stem ca. 1 cm thick, sparingly branched, ribbed. Leaves petiolate, petioles 5–20 cm, sheaths oblong, glabrous; blade triangular-ovate, 7–20 × 12–17 cm, 2–3-ternate-pinnate; leaflets sessile, ovate to ovate-lanceolate, often 3-lobed, 2–3 × 1–2 cm, base cuneate, margin ciliate, incised-serrate, apex acuminate, glabrous or pubescent along nerves. Umbels 8–10 cm across; peduncles 5–10 cm, pubescent; bracts absent or 1–2, deciduous; rays 10–20(–50), subequal, scabrous; bracteoles 5–8, linear-lanceolate, pubescent, longer or equaling pedicels; umbellules 15–20-flowered. Calyx teeth minute or obsolete. Petals yellowish white, long-ovate. Fruit ellipsoid-oblong, 4–5 × 3–4 mm; dorsal ribs filiform, lateral ribs winged, wings narrower than the body; vittae in each furrow, 2 on commissure. Fl. Apr–May, fr. Jun–Jul.
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