Plants perennial, 30–90(–150) cm. Root cylindric, gray-yellow, 7–18 × 1–2 cm, slightly aromatic. Stem purplish green, thinly ribbed, glabrous. Leaves petiolate, petioles 10–30 cm, sheaths 4–7 cm, narrow-ovate; blade rhombic-triangular, 12–17 × 10–12 cm, 2-ternate-pinnate, pinnae remote, 3–4 pairs; leaflets lanceolate to broad-lanceolate, 2.5–4 × 1–2 cm, base subrounded to cuneate, margin densely cuspidate-serrulate, glabrous or puberulous along nerves abaxially. Umbels 5–10 cm across; peduncles ribbed, pubescent along ribs; bracts 3–9, purplish, lanceolate, ciliate; rays 30–50, 2.5–4 cm, up to 9 cm when fruiting, unequal, ribbed, pubescent along ribs; bracteoles 6–10, long-lanceolate, ciliate; umbellules 10–35-flowered. Calyx teeth obsolete. Petals white, obovate. Fruit suborbicular, 4–6 × 3–5 mm, margin often purplish red; dorsal ribs prominent, lateral ribs broad-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Sep, fr. Aug–Oct. n = 11*.
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