Plants stout. Stem thinly ribbed, pubescent. Leaves petiolate, sheaths inflated; leaf blade 2-ternate-pinnate; leaflets subrhombic or ovate, occasionally 3-lobed, 8–14 × 6–10 cm, margin cuspidate-serrate or biserrate, ciliate, apex acute to caudate-acute, pubescent along nerves abaxially. Bracts absent; rays 16–18, 4–12 cm, unequal, densely yellowish pubescent; bracteoles many, lanceolate, apex caudate-acuminate, ca. 0.5 × pedicels; pedicels numerous, flat, unequal, pubescent. Calyx teeth obsolete. Petals ovate or obovate. Anthers purple-red. Fruit narrow-ellipsoid, 5–6 × 3–3.5 mm; dorsal ribs filiform, lateral ribs narrow-winged, wings about half as broad as the body; vittae 1 in each furrow, 4 on commissure. Fl. Aug.
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