Stem erect, 15-120 cm tall, to 2.8 cm in diam. at base, hollow, proximally glabrous, distally white arachnoid-puberulent. Basal leaves petiolate; petiole 4-20 × 1-3 cm, base semiamplexicaul; leaf blade ovate-oblong or broadly ovate, 8-20 × 4-20 cm, both surfaces initially white arachnoid-puberulent, pinnately veined, with robust midvein to 2 cm wide, with prominent reticulate veins, base truncate or oblique, margin irregularly dentate, apex rounded. Middle stem leaves sessile or shortly petiolate, base semi-or auriculate-amplexicaul; leaf blade ovate or oblong, to 15 × 12 cm. Distalmost stem leaves smaller, sessile, ovate-lanceolate. Synflorescence racemose, clustered initially, elongating in fruit, to 40 cm; leaflike bracts linear-lanceolate, to 2 cm, apex acuminate; peduncles unequal, smaller distally, proximal peduncles to 8 cm, distal peduncles curved. Capitula numerous; supplementary bracts linear. Involucre broadly campanulate or hemispheric, 1.5-2 × to 2.5 cm, outside glabrous or sparsely white arachnoid-puberulent; phyllaries 8-13, in 2 rows, oblong or lanceolate, 3-8 mm wide, apex acute. Ray florets 6-8, yellow; lamina ovate-oblong or elliptic, to 16 × ca. 6.5 mm; tube ca. 4 mm. Tubular florets numerous, ca. 1 cm; tube ca. 3 mm. Achenes brown, cylindric, 4-8 mm. Pappus white, as long as tubular corolla. Fl. and fr. Jul-Sep.
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