Plants 80–120 cm. Root cylindric, brown, simple or branched. Stem thinly ribbed, base purplish green, branched above. Basal and lower petioles 4–18 cm, sheaths narrow-ovate, white-membranous-margined; leaf blade broadly triangular-ovate, 2–3-ternate-pinnate, primary and secondary pinnae petiolulate; leaflets subsessile, broad-ovate to rhombic-ovate, 2–5 × 1.5–3 cm, base cuneate, margin 2–4-lobed, coarsely white-mucronate-toothed, apex acute to long-acuminate, hispidulous along nerves on both surfaces. Umbels 2–10 cm across; bracts 4–8, linear-lanceolate to lanceolate, 5–8 mm; rays 6–14, 1.5–3 cm, unequal, scabrous; bracteoles 5–10, subulate to linear-lanceolate. Calyx teeth triangular-ovate, acute. Petals white, obovate, base clawed. Fruit broad-ellipsoid, 4–6 × 4–5.5 mm; dorsal ribs prominent, lateral ribs broad-winged; vittae 1 in each furrow, 2 on commissure. Fl. Jul–Sep, fr. Aug–Oct. n = 9*.
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