Plants perennial, 60–100 cm, glabrous. Root cylindrical, 3–8 × ca. 0.8 cm. Stem little-branched, often tinged purple at base. Lower petioles 6–14 cm; blade ternate-2-pinnate; primary pinnae 4–5 pairs; ultimate segments ovate or lanceolate, 10–20 × 5–10 mm, abaxially pubescent along veins, margins irregularly incised. Upper leaves smaller, 1–2-pinnate or 3-lobed, lobes lanceolate. Umbels 4–10(–14) cm across; bracts 5–6, linear, 3–20 mm; rays 4–10(–13), 2–3 cm in flower, subequal, lengthening to 5–6 cm and spreading in fruit; bracteoles 2–6, linear-filiform, 2–13 mm; umbellules 9–15 mm across, 5–12-flowered; pedicels 0.5–6 mm, very unequal, lengthening to 10–20 mm in fruit. Calyx teeth obsolete. Petals white, broad-ovate, abaxially pilose, apex notched with incurved lobule. Stylopodium conic; styles ca. equal to stylopodium. Fruit ovoid, 2–3 × ca. 2 mm, base cordate, surface glabrous; vittae 2–3 in each furrow, 2 on commissure. Seed face slightly concave. Fl. Jun–Jul, fr. Aug–Sep.
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