Plants perennial, 80–100 cm, glabrous. Root cylindrical, ca. 10 × ca. 0.4 mm. Stem 2–3-branched, base clothed with fibrous remnant sheaths. Basal petioles 5–10 cm; blade triangular in outline, 10–15 × 5–10 cm, ternate-2-pinnate, primary pinnae 4–5 pairs; ultimate segments broad-ovate or suborbicular, 1–2 × 1–1.5 cm, margins coarsely serrate. Cauline leaves similar to basal, smaller, ternate-1-pinnate or 3-lobed. Umbels 6–8 cm across, mainly terminal, lateral umbels 2–3; bracts 1–3, lanceolate, 16–20 × 1–2 mm; rays 6–8, 4–6 cm, subequal; bracteoles 4–6, linear, 3–4 mm; umbellules 5–8 mm across; many-flowered; pedicels 4–6 mm. Calyx teeth conspicuous, triangular, ca. 0.3 mm. Petals white, broad-ovate, apex slightly incurved. Stylopodium domed; styles ca. 1 × stylopodium. Fruit ovoid, ca. 4 × 2.5 mm, base cordate; vittae 1 in each furrow, 2 on commissure. Seed face plane. Fl. Jun–Jul, fr. Jul–Sep.
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