Stem erect, to 100 cm tall, 6-10 mm in diam. at base, shortly brown pilose and white arachnoid-puberulent. Basal leaves petiolate; petiole to 45 cm, white puberulent, base sheathed; leaf blade cordate or broadly ovate-cordate, 9.5-16 × 14-22 cm, thin, abaxially sparsely shortly pilose or pubescent only along veins, adaxially glabrous, pinnately veined, base cordate, margin regularly dentate and ciliate, apex rounded or rarely mucronate; sinus ca. 1/4 as long as leaf blade. Middle stem leaves smaller, shortly petiolate; petiole winged; sheath slightly enlarged, semiamplexicaul. Distal stem leaves sessile, ovate-lanceolate, to 7 cm. Synflorescence racemose, to 59 cm; leaflike bracts narrowly lanceolate to linear, 1.5-4 mm, margin dentate, apex acuminate; peduncles often 2-4, crowded or solitary, proximal ones to 9.5 cm, with 2-4 capitula. Capitula numerous; supplementary bracts linear to linear-lanceolate. Involucre turbinate, 5-11 × 5-7 mm, outside shortly pilose; phyllaries 7 or 8, in 2 rows, oblong or lanceolate, apex acute or acuminate; inner phyllaries brown membranous at margin. Ray florets 4 or 5, yellow; lamina linear, 9-15 × 1-1.5 mm, apex acute; tube 4-6 mm. Tubular florets numerous, 8-10 mm; tube 4-5 mm. Pappus dirty brown, slightly longer than tube of tubular corolla. Fl. Jul-Sep.
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