Plants perennial, 1–2 m. Stem thinly ribbed, pubescent at upper nodes. Basal and lower leaves petiolate, petioles 15–25 cm, sheaths inflated; blade ovate to broad-ovate, 20–30 × 15–30 cm, 2–3-ternate-pinnate, rachis and petiolules geniculate; leaflets long-ovate, 3–6 × 1.7–2.5 cm, base cuneate, margin irregularly coarse-serrate, sometimes 1–2-lobed, spiny-hispid along nerves adaxially. Umbels 4–7 cm across; bracts 1, long-ovate, 2–2.5 cm, apex acuminate; rays 14–20, 1.5–3.5 cm, unequal, scabrous; bracteoles 5–7, linear, 5–7 mm, white-scarious-margined, pubescent; umbellules 20–25-flowered; pedicels unequal, pubescent. Calyx teeth obsolete. Petals white, ovate to broad-ovate. Fruit narrow-oblong, 6–7 × 3–3.5 mm; dorsal ribs thickly protruding, lateral ribs narrow-winged; vittae 1 in each furrow, 2–4 on commissure. Fl. and fr. Aug–Oct. n = 55*.
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