Plants 70–100 cm. Stem shallowly fluted, subglabrous, few-branched above. Basal petioles 10–20 cm; blade broad-triangular, 10–15 cm, ternate-2-pinnate; pinnae petiolulate; petiolules 3–6 cm; ultimate segments subovate, 3–11 × 2–6 cm, undivided or 2–3-lobed, both surfaces slightly roughened, sharply serrate or doubly serrate. Upper leaves smaller, 3-lobed, lobes ovate or ovate-lanceolate, sharply serrate. Terminal umbels 5–9 cm across; rays 13–20, 2–5 cm, somewhat unequal, apical parts roughened; umbellules 10–15 mm across, pedicels 2–9 mm, unequal. Petals white. Styles ca. 2 mm, 4–5 × stylopodium. Fruit subovoid, 4–6 × ca. 3 mm. Fl. and fr. May–Jul.
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