Plants perennial, 1–2 m high. Root brown, conic, 1–2 cm thick, strongly aromatic. Stem often purple-green, ribbed, glabrous. Petioles 13–36 cm, sheaths purple, elliptic; blade triangular to ovate, 10–25 cm, 1–2-ternate-pinnate; leaflets ovate or oblong-lanceolate, 5–15 × 2–5 cm, base decurrent, margin white-cartilaginous and cuspidate-serrate, apex acute, midribs often purple-green, hispidulous along nerves adaxially. Peduncles 3–8 cm, pubescent; bracts 1–3, purplish, ovate, sheath-like, reflexed; rays 10–22, 2–4 cm, pubescent; bracteoles 3–8, linear to lanceolate, green or purple; pedicels pubescent. Calyx teeth triangular-subulate. Petals dark purple, obovate or ellipsoid-lanceolate, apex incurved but not notched. Anthers dark purple. Fruit oblong to ovoid-orbicular, 4–7 × 3–5 mm; dorsal ribs filiform, acute, lateral ribs thickly narrow-winged; vittae 1–3 in each furrow, 4–6 on commissure. Fl. Aug–Sep, fr. Sep–Nov. n = 11*.
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A herb. It keeps growing from year to year. It grows 1-2 m tall. The roots are brown and cone shaped. They are brown, 1-2 cm thick and have a strong smell. The leaf stalks are 13-36 cm long and have purple sheaths. The leaves are oval or triangle shaped and 10-25 cm long. The leaflets are oval and 5-15 cm long by 2-5 cm wide.
Grassy places in woods in lowland and hills, C. and S. Japan. Damp soils in China. Forest margins, shrubby thickets, slopes, streamsides; at elevations from 200-800 metres.
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It is a temperate to subtropical plant. It grows near streams between 200-800 m above sea level.
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