Plants 50–60 cm. Stem shortly pubescent, upper branches opposite or cyclic, base without remnant sheaths. Basal petioles short, pubescent; blades broad-ovate, 25–30 × 25–35 cm, 3–4-ternate-pinnate; primary and secondary pinnae long-petiolulate, petiolules 4–10 cm; ultimate segments linear, 5–20 × 0.5–1.5 mm, margin ciliate. Umbels 8–15 cm across, cymosely arranged; peduncles 4–7 cm; bracts 5, linear, 8–12 mm, unequal; rays 5–10(–18), 2–5 cm, glabrous or sparsely scabrous; bracteoles 5–6, ovate-lanceolate, 2–4 mm, unequal, shorter than flowers, scarious; pedicels 7–12, 2–5 mm, elongating to 9 mm in fruit. Petals yellow, oblong-acuminate, glabrous. Ovary glabrous. Fruit obovoid-ellipsoid, 10–18 × 5–10 mm; primary ribs prominent, winged, secondary ribs thinly filiform. Fl. May, fr. Jun. n = 11.
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