Rhizomes robust, with many fibrous roots. Stem solitary, erect, 100-150 cm tall, striate, sparsely arachnoid. Leaves long petiolate, papery; petiole 5-14 cm, not winged, shortly pubescent or subglabrous; median leaves adaxially green, broadly ovate-cordate, 9-16 × 12-20 cm, abaxially densely white arachnoid or later glabrescent, adaxially sparsely adpressed shortly hairy or subglabrous, palmately 5-7-veined, veins abaxially prominent, adaxially impressed, base deeply cordate, margin stoutly undulate-toothed, teeth mucronulate, apex acute or shortly acuminate. Upper leaves shortly petiolate, gradually smaller upward. Capitula numerous, usually arranged in crowded spicate racemes; peduncles ca. 9 mm, with 3 linear-lanceolate bractlets, arachnoid. Involucres cylindric, 1.2-1.4 cm; phyllaries 5, oblong-lanceolate, glabrous, margin scarious, apically rounded-obtuse. Florets 5-8; corolla yellow or white, ca. 8 mm, tube slender, ca. 3 mm, limb broadly tubular; lobes triangular. Anthers exserted from corolla, basally caudate. Style branches excurved, apically truncate, papillose. Achenes cylindric, 5-7 mm, glabrous, ribbed. Pappus white, 7-9 mm. Fl. Aug-Sep, fr. Oct.
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