Plants 30–120 cm or more, stout, subglabrous. Root cylindrical. Stem erect, striate, branched, base clothed in fibrous remnant sheaths. Basal petioles 5–10 cm; blade ovate-lanceolate, 5–8(–15) × 3–5(–10) cm, 2–3-pinnate, primary pinnae 4–5 pairs, remote; ultimate segments oblong-ovate, 10–20 × 5–10 mm, abaxially pale green, margins incised. Upper leaves reduced, 1-pinnate or 3-lobed, sessile. Umbels terminal and lateral, 3–5 cm across; bracts 1–4, linear, caducous; rays 15–25(–40), subequal, 2–4 cm; bracteoles 6–12, linear; umbellules many-flowered. Calyx teeth small, triangular, caducous. Petals white, obovate, base cuneate. Styles ca. 2 × stylopodium. Fruit oblong, 3–5 × 1.5–3 mm; ribs all narrowly winged, lateral wings broader; vittae 2–3 in each furrow, 4–6(–8) on commissure. Seed face plane. Fl. Jul–Aug, fr. Aug–Sep.
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