Plants perennial, 30–150 cm, glabrous. Root fusiform. Basal petioles 3–7 cm; blade triangular-ovate in outline, 10–20 × 10–25 cm, 3-ternate; leaflets oblong-lanceolate or oblong-rhombic, 1–3 × 1–2 cm, margins serrate or pinnatifid. Cauline leaves similar to basal, 3-lobed, lobes linear-lanceolate, or reduced to bladeless sheaths. Umbels 3–7 cm across, terminal umbels with hermaphrodite and sterile flowers, flowers in lateral umbels all sterile; bracts absent; rays 5–7, 4–5 cm, shortly pubescent; bracteoles few, linear, 2–14 mm; umbellules ca. 6 mm across in flower, to 16 mm across in fruit, many-flowered; pedicels 2.5–3 mm, about equal, those of the fertile flowers elongating to 7 mm in fruit. Calyx teeth obsolete. Petals white, ovate or oblong-ovate, apex mucronate, without incurved lobule. Stylopodium conic; styles 2–4 × stylopodium. Fruit ovoid, 1.5–2.8 × 0.5–1.8 mm, base cordate, surface glabrous; vittae 3–4 in each furrow, 2–4 on commissure. Seed face slightly concave. Fl. and fr. Jul–Sep.
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