Plants 80–100 cm. Stem ribbed, branched. Basal and lower petioles 10–30 cm; sheaths very broad, auriculate; blades broad-ovate in outline, 30–40 × 15–25 cm, 3–4-ternate-pinnate, pinnae long-petiolulate, ultimate segments oblong-ovate to broad-ovate, 5–15 × 2.5–7 cm, oblique-cuneate, regular-crenate, apiculate, sparse-setose along nerves abaxially. Leaves reduced upwards; sheaths inflated, conspicuous. Umbel 8–10 cm across; peduncle 10–15 cm; bracts 3–8, linear, 2–3.5 × 1–3 mm; rays 20–25, subequal, 5–8 cm in fruit, scabrous; bracteoles ca. 8, linear, 10–15 × ca. 1 mm, uniform green; pedicels numerous, 7–10 mm, flattened, slightly scabrous. Calyx teeth obsolete. Petals broad-obovate, white. Stylopodium short-conic. Fruit narrow-oblong, dark brown, 10–15 × ca. 4 mm; ribs all narrowly winged; vittae 1 in each furrow, 2 on commissure. Seed face slightly concave. Fl. and fr. Jul–Sep.
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