Plants perennial, 1.5–2 m. Stem purple-green, ribbed, branched. Basal and lower leaves petiolate, petioles 10–30 cm, sheaths inflated; blade broad-ovate, 25–60 × 20–50 cm, 3–4-pinnate; leaflets ovate to broad-ovate, 3–7 × 2–5 cm, base oblique, margin coarse-toothed, scabrous along nerves adaxially, glaucous abaxially. Umbels 6–8 cm across; bracts 1, ovate, acuminate, deciduous; rays 20–30, 2–5 cm, unequal; bracteoles ca. 5, linear, ca. 3 mm; pedicels 25–30, unequal. Calyx teeth conspicuous, triangular-ovate. Petals green, obovate. Fruit suborbicular, 5–7 × 5–7 mm; dorsal ribs prominent, lateral ribs broad-winged; vittae 1 in each furrow, 2 on commissure. Fl. and fr. Jul–Sep. n = 11*.
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