Plants stout, to 1 m high. Lower leaves broadly ovate, to 28 × 11 cm, 2-pinnate; ultimate segments ovate to broadly ovate, 4–5 × 2–3 cm, abaxially puberulent on major veins, margins serrate. Upper leaves reduced, smaller, sessile. Peduncles stout, 7–12 cm; bracts 5, linear, 1–1.5 cm; rays 35–45, unequal, 7–9 cm, puberulent; bracteoles 5, linear, 2–4 mm. Calyx teeth conspicuous, narrowly triangular. Petals white, outer flowers in umbel radiant. Fruit obovoid, 7–9.5 × 7–10 mm, glabrous; dorsal and intermediate ribs filiform, closely spaced, lateral ribs broadly winged, wings 2.5–3.5 mm, wider than width of mericarp body; vittae filiform, extending to 1/2 or 2/3 of mericarp, solitary in each furrow, 2 on commissure. Seed face plane. Fl. and fr. Jul–Sep.
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