Plants perennial, 80–150 cm. Root cylindric, brown, ca. 12 × 1–3 cm, aromatic. Stem stout, dark purple at base, ribbed, densely white-hispidulous. Leaves petiolate, petioles 15–40 cm, sheaths 2–3 cm wide membranous, inflated; blade triangular-ovate, up to 25 × 17 cm, 2-ternate-pinnate; leaflets subsessile, oblong to elliptic, 5–9 × 2–3 cm, often 2–3-lobed, terminal leaflets base decurrent, margin white-cartilaginous, serrulate and ciliate, apex acuminate, white-pubescent abaxially. Bracts several, linear-lanceolate, ciliate, villous abaxially, apex sometimes pinnate; rays 40–60(–80), densely pubescent; bracteoles 3–7, linear-lanceolate, ciliate; umbellules 40–60-flowered. Calyx teeth obsolete. Petals white. Styles pubescent. Fruit broad-ellipsoid, 4–6 × 3–4 mm; dorsal ribs acute-prominent, lateral ribs broad-winged, as wide as or slightly narrower than the body; vittae 1 in each furrow, 3–4 on commissure. Fl. Aug, fr. Aug–Sep. n = 11*.
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