Plants 80–120 cm or more, robust. Root dark brown, long-conic, 3–4 cm across. Stem thinly ribbed, glabrous. Basal leaves with long petioles, 20–40 cm, sheath narrow-oblong, 4–5 cm; blades oblong, 3–4-ternate-pinnate; ultimate segments oblong or ovate-oblong, 4–10 × 2.5–4 cm, scabrous along nerves abaxially, cuneate, irregularly serrate or 3-lobed, apex acute. Stem leaves reduced upwards, sheaths strongly inflated and auriculate, membranous. Umbels 8–10 cm across, peduncle ca. 30 cm; bracts 5–8, linear-lanceolate, 2–3 × ca. 0.8 cm, apex caudate, deciduous; rays 15–25, 5–8 cm in flower, to 15 cm in fruit; bracteoles 5–8, narrow-lanceolate, 1–2 × 0.3–0.5 cm, membranous, green, margin sometimes pale; pedicels ca. 25, 1–1.5 cm. Calyx teeth obsolete. Petals ovate, white or tinged purplish-red, 2–2.75 × ca. 1.75 mm. Anthers dark purple. Fruit oblong, dark brown, 8–14 × 3–4 mm; dorsal ribs prominent, lateral ribs narrowly winged; vittae 1–2 in each furrow, 2–3 on commissure. Seed face concave. Fl. Jun–Aug, fr. Aug–Sep. 2n = 22*.
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An annual herb. It grows to about 1 m high. The leaves have stalks. They are once or twice divided into leaflets. The small leaflets are 7-15 cm long. They are narrow. The flowers are white. The fruit is oblong and narrow.
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