Plants perennial, 0.7–2.5 m. Root conic, brown. Stem ca. 2 cm thick, thinly ribbed, glabrous or sparsely hispidulous. Petioles ca. 20 cm, sheaths ovate, 2.5–4 cm; blade triangular-ovate, 20–40 × 20–35 cm, 2-ternate-pinnate, pinnae 1–3 pairs, long-petiolulate, the terminal pinnae unequally 2-lobed; leaflets oblong to elliptic, 5–12 × 2–6 cm, irregularly 2–3-lobed, margin acute-serrate, apex acuminate or caudate-acuminate, hispidulous along nerves on both surfaces. Umbels up to 10 cm across; peduncles 4–10 cm, densely brown-hispidulous; bracts absent or 1; rays 20–40, very unequal, densely brown-hispidulous; bracteoles absent; umbellules 16–32-flowered; pedicels glabrous or pubescent. Calyx teeth obsolete. Petals dark purple-red, oblong-ovate. Fruit ovoid to suborbicular, 4.5–7 × 4–6 mm; dorsal ribs prominent, lateral ribs broad-winged, wings wider than the body; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Sep, fr. Sep–Oct.
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A herb. It keeps growing from year to year. It can grow to 2.5 m tall. The root is cone shaped and brown. The stem is 2 cm across and has thin ribs. The leaf stalks are about 20 cm long. The leaves are triangle or oval shaped and 20-40 cm long by 20-35 cm wide. There are 1-3 pairs of leaflets. The end one has unequal lobes. The leaflets are 5-12 cm long by 2-6 cm wide.
It is a temperate plant. It grows in grassland and beside streams between 1,500-2,000 m above sea level in Sichuan in China.
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In grasses, by streams or in forests; at elevations from 1,500-2,000 metres in Sichuan.
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