Plants perennial, 30–50 cm, stout. Root short conic. Petioles 5–10 cm, sheaths inflated; blade ovate, up to 20 × 10–15 cm, pinnate; proximal pinnae 3-lobed, middle and distal pinnae oblong-lanceolate, 5–8 × 1–2 cm, base attenuate or broad-cuneate, margin serrate, apex acuminate. Umbels 10–12 cm across; peduncles ca. 5 cm; bracts linear-lanceolate, ca. 1 cm, deciduous; rays 20–50, unequal, scabrous; bracteoles linear, 4–7 mm, glabrous; pedicels ca. 20, up to 7 mm. Calyx teeth minute, triangular-ovate. Petals white, oblong. Stylopodium margin sinuate. Fruit oblong, 5–8 × 3–4 mm, dorsal ribs prominent, lateral ribs broad-winged; vittae 1 in each furrow, 2 on commissure. Fl. and fr. Aug–Oct.
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