Plants 50–75 cm. Rhizome stout, conic, ca. 6 × 1 cm. Stem purplish, branched. Lower leaves petiolate, petioles 10–20 cm, sheaths ovate; blade, 8–13 × 10–15 cm, 2–5-pinnate; ultimate segments linear or linear-lanceolate, 0.3–6.5 × 1–2.5 mm. Umbels 6–8 cm across; peduncles 4–11 cm; bracts and bracteoles usually absent; rays 10–18, 1.5–6 cm, unequal, 4-angled; umbellules 8–12 mm across, 12–16-flowered; pedicels ca. 5 mm, slender. Calyx teeth obsolete or nearly so. Petals white, linear or narrowly spatulate, 1.5–3 × 0.1–0.4 mm; apex acute or obtuse-acute. Fruit broad-ovoid, ca. 1.8 × 1.5 mm, base cordate; vittae 3 in each furrow, 2 on commissure. Fl. Jun–Jul, fr. Aug–Sep.
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