Stem erect, 80-120 cm tall, to 2.5 cm in diam. at base, shortly pilose and white arachnoid-puberulent. Basal leaves petiolate; petiole ca. 15 cm, winged; wings to 4 cm wide, entire; leaf blade elliptic or ovate-oblong, rarely obovate, 15-60 × to 45 cm, pinnately veined, midvein strong, white arachnoid-puberulent, base shallowly cordate, margin minutely denticulate, apex rounded. Middle stem leaves sessile, cymbiform, to 20 cm, both surfaces white arachnoid-puberulent, sheath amplexicaul. Distalmost stem leaves sheathlike. Compound corymb much branched, to 40 cm, white arachnoid-puberulent and shortly pilose; leaflike and supplementary bracts smaller, linear; peduncles 2-15(-22) mm. Capitula numerous. Involucre campanulate, 8-10 mm, mouth to 1 cm in diam., outside white arachnoid-puberulent or glabrous; phyllaries 7-10, in 2 rows, ovate-lanceolate or lanceolate, margin brown membranous, apex acute. Ray florets yellow; lamina linear, 1-1.4 cm × 1.5-2 mm; tube 4-5 mm. Tubular florets numerous, deep yellow, 6-7 mm; tube ca. 2 mm. Achenes blackish gray, narrowly cylindric, 3-6 mm. Pappus white or yellowish, as long as tubular corolla. Fl. and fr. Jul-Sep.
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