Plants 60–100 cm, stout. Stem rarely branched. Basal leaves petiolate, petioles 5–10 cm, base sheathing; blade ovate to triangular, 12–15 × 10–12 cm, 2–3-pinnatisect; pinnules ovate to ovate-lanceolate, 1–1.5 × 0.5–1 cm, deeply lobed. Umbels ca. 5 cm across; bracts ca. 5, linear to lanceolate; rays 8–10, subequal, pubescent; bracteoles ca. 5, filiform, 3–5 mm; umbellules ca. 8 mm across, ca. 15-flowered. Petals oblong-ovate. Stylopodium conic; styles long, reflexed. Fruit oblong-oval, ca. 6 × 4–5 mm, not strongly dorsally compressed; ribs all prominent; vittae 4 or 5 in each furrow, 8–9 on commissure. Fl. and fr. Aug–Oct.
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