Plants 0.8--1.5 m tall, glabrous. Stems few branched. Basal and proximal cauline leaves withered at anthesis. Distal cauline leaf petiole 0.9--4 cm; leaf blade 2-or 3-ternate, ca. 25 cm; leaflet blade orbicular or cordate, 4.4--8.5 × 4.2--8.5 cm, papery, base cuneate, rounded, or subcordate, apex obtuse, 3-lobed; lobes toothed; veins raised on both surfaces. Inflorescence paniculate, 30--40 cm; branches few, 2--8 cm, many flowered. Bracts triangular. Pedicel 4--6 mm. Sepals 4, deciduous, red tinged, elliptic; 3--4.5 × ca. 2.2 mm. Stamens ca. 35, ca. 6.5 mm; filament narrowly linear; anther narrowly oblong, ca. 2 mm, apex rounded. Carpels 3--9; style short; stigma persistent, 0.6--1 mm. Achenes sessile; body narrowly ovoid, ca. 4.5 mm; veins ca. 6, stout. Fl. Aug--Sep.
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