Plants perennial. Stem stout, ribbed, villous when young. Cauline leaves petiolate, petioles ca. 10 cm, winged with narrow-oblong sheaths, densely pubescent; blade broad-ovate, 30–35 cm, 3-ternate-pinnate, rachis densely pubescent; pinnae 4 pairs, long petiolulate, leaflets subsessile, oblong-ovate to suborbicular, 2.5–6 × 1.7–4.5 cm, entire or 2–3-lobed, margin serrulate, pubescent along nerves on both surfaces. Peduncles 4–6 cm, densely pubescent; bracts absent; rays 25–50, 3–10 cm, unequal, scabrous along one side; bracteoles 7–10, linear-lanceolate, 4–6 mm, sparse-ciliate, pedicels 4–10 mm. Calyx teeth obsolete. Petals white, obovate, notched. Stylopodium short-conic. Fruit young, ribs narrow-winged (mature fruit unknown). Fl. Aug.
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