Plants perennial, 2.4–2.7 m. Stem stout, ribbed, branched above. Middle and upper cauline leaves petiolate, sheaths inflated; blade 2–3-pinnate; leaflets short petiolulate or sessile, lanceolate, 5–10 × 2–5 cm, base cuneate or decurrent, margin irregularly serrate and ciliate, apex long caudate-acuminate. Umbels up to 20 cm across; peduncles long; bracts absent; rays ca. 40, unequal, up to 8 cm in fruit; bracteoles several, linear, equaling pedicels; pedicels 25–50, up to 25 mm, subequal, slender, scabrous. Young fruit dorsal ribs prominent, lateral ribs broad-winged (mature fruit unknown); vittae 1 in each furrow. Fl. Jul–Aug.
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