Stem erect, to 170 cm tall, to 1 cm in diam. at base, glabrous or distally shortly yellow pilose. Basal leaves petiolate; petiole shortly yellow pilose, to 31 cm, base enlarged sheathed; leaf blade reniform or cordate, 5-16 × 7-50 cm, glabrous, palmately veined, with 3-5 principal veins and prominent reticulate veins, margin irregularly dentate, apex rounded; sinus ca. 1/3 as long as leaf blade, broad, basal lobes orbicular. Middle stem leaves petiolate; petiole 4-9.5 cm, densely shortly yellowish green pilose; sheath much enlarged, to 5 × ca. 4 cm, shortly yellow pilose, mouth of sheath entire; leaf blade reniform, 4-10 × 8-20 cm, margin denticulate, apex retuse. Distalmost stem leaves only sheathed. Compound corymbs to 20 cm; branches spreading, pubescent; leaflike and supplementary bracts minute, linear-subulate; peduncles to 1 cm, densely shortly yellow pilose. Capitula numerous. Involucre narrowly cylindric, 8-13 × 3-4 mm, outside glabrous; phyllaries 5, in 2 rows, oblong, ciliate, apex triangular-acute; inner phyllaries broadly membranous at margin. Florets (5 or)6(or 7), yellow, all tubular, 6-9 mm, wholly extending from involucre; tube as long as limb. Achenes brown, cylindric, 5-7 mm. Pappus white or lower part yellow, as long as tube of tubular corolla. Fl. and fr. Jul-Sep.
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