Plants 50–100 cm. Stem stout, terete, shallowly fluted, hollow, branches spreading. Lower leaves petiolate, petioles 4–7 cm; blade broad-triangular, ca. 23 cm, ternate-3–4-pinnate; ultimate segments ovate or broad-ovate, 1.5–2.5 × 1–1.5 cm, base cuneate, margins and nerves roughened on both surfaces. Upper leaves reduced, ternate-pinnate. Umbels 3–5 cm across; peduncles 8–15 cm, apex roughened; rays 9–11, 3–4(–6) cm, slightly roughened; umbellules 0.8–1.4 cm across, many-flowered; pedicels 3–10 mm, unequal. Petals white. Styles 1–2 × stylopodium. Fruit oblong-ovoid to long-ovoid, ca. 3.5 × 2 mm. Fl. and fr. Jul–Aug.
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