Stem erect, robust, to 150 cm tall, 1-1.5 cm in diam. at base, densely yellow shortly pilose. Basal leaves petiolate; petiole to 38 cm, shortly yellow pilose, base enlarged sheathed; leaf blade orbicular-reniform, 7-21 cm, to 50 cm wide, glabrous, palmately veined, abaxially with prominent reticulate veins, margin densely minutely denticulate, apex rounded or retuse; sinus ca. 1/3 as long as leaf blade, narrow. Middle stem leaves shortly petiolate, base enlarged sheathed; sheath broadly ovate, to 7 × ca. 4 cm, shortly yellow pilose; leaf blade reniform, 2.7-6.5 × to 13 cm. Compound corymbs ca. 38 cm; branches densely shortly yellow pilose; leaflike and supplementary bracts filiform-subulate, to 1.3 cm; peduncles 5-15 mm, shortly yellow pilose. Capitula numerous. Involucre narrowly campanulate, 6-8 mm in diam., outside shortly yellow pilose; phyllaries 8-10, narrowly lanceolate, 9-15 × 2-3(-4) mm, margin narrowly membranous, apex acuminate. Florets more than 20, yellow, all tubular, 8-9 mm; tube ca. 4 mm. Achenes brown, cylindric, 5-8 mm. Pappus white, as long as tubular corolla. Fl. and fr. Jul-Sep.
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