Plants perennial, 40–80 cm, glabrous. Root stout, up to 50 × 2.5 cm, brown, dense annular scars, aromatic. Stem thinly ribbed, branched. Basal and lower petiole sheaths long-ovate; blade broad-triangular, 15–30 × 15–20 cm, 2–3-ternate, pinnae petiolate; leaflets broad-ovate, 3–6 × 1.5–4 cm, base cuneate to cordate, 5–6-basal-nerved, margin irregularly serrulate, apex obtuse-rounded or acute. Umbels 6–12 cm across; bracts absent; rays 12–23; bracteoles 6–8, lanceolate, reflexed; umbellules 15–25-flowered. Calyx teeth obsolete. Petals white or yellowish green, ovate. Fruit narrow-oblong, 7–11 × 4–6 mm; dorsal ribs obtuse-rounded, lateral ribs broad-winged, as wide as the body; vittae small, 1 in each furrow, 2 on commissure. Fl. Jun–Jul, fr. Jul–Aug. n = 11*.
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A herb that keeps growing from year to year. It grows 40-80 cm tall. The root is stout and 50 cm long by 2.5 cm wide.
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