Plants 1–2 m, robust. Root dark brown, 2–3 cm across, branched, strongly aromatic. Stem hollow, ribbed, scabrous to glabrous. Basal and lower petioles 15–30 cm, sheaths ovate, broad; blades broadly triangular-ovate, 15–30 cm, 2–3-ternate-pinnate; ultimate segments narrowly ovate or lanceolate, 2–6 × 0.5–2.5 cm, irregular-pinnatifid, veins and margin hirtellous. Leaves reduced upwards. Umbels large, 10–20 cm across; bracts numerous, linear or lanceolate, 2–8 cm, apex entire or pinnate, reflexed; rays 20–40(–60), unequal, hirtellous; bracteoles 6–9, linear-lanceolate, 5–10 × 1–3 mm, apex entire or pinnate; pedicels 10–12 mm, scabrous. Calyx teeth triangular-ovate. Petals broad-obovate, white, 2–2.5 mm. Stylopodium short-conic. Fruit broad-ovoid, 6–10 × 3–6 mm; ribs all thickly cristate-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jun–Jul, fr. Jul–Aug. n = 11.
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A herb or shrub. It grows 1-2 m tall. The stems are hollow and ribbed. The leaves are broadly oval or triangle shaped. They are 15-30 cm long.
Coniferous forests, forest edges, pine forest, birch-aspen forests and felled forests, rarely in sub-alpine meadows, ravines and near swamps.
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It is a temperate plant. It grows in forests along stream banks.
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