Stem erect, 35-60 cm tall, 3.5-5 mm in diam. at base, proximally glabrous, distally and synflorescence white puberulent and shortly yellowish brown pilose. Basal leaves petiolate; petiole 15-35 cm, glabrous, base narrowly sheathed, distally narrowly winged; leaf blade broadly hastate or triangular-hastate, 4-11 × 9-15 cm, glabrous, palmately veined, margin regularly dentate, apex rounded or triangular-acute; sinus broad; basal lobes divergent, 2.5-5 cm, outer margin coarsely dentate. Middle stem leaves petiolate or sessile; sheath enlarged, to 7 cm, margin dentate or rarely entire; leaf blade smaller, triangular-or cordate-hastate. Distal stem leaves sheathlike, broadly ovate to ovate-lanceolate, margin dentate. Synflorescence racemose, 10-30 cm, clustered or lax; leaflike bracts ovate to lanceolate, proximal ones to 5 cm, smaller upward, margin dentate, apex acute; peduncles to 1.3 cm. Capitula 7-24; supplementary bracts narrowly lanceolate, margin dentate. Involucre broadly campanulate, 9-11 × 8-12 mm, outside glabrous; phyllaries 8-10, in 2 rows, oblong, 3-5 mm wide, apex triangular-acute, mucronate; inner phyllaries broadly brown membranous at margin. Ray florets yellow; lamina linear-oblong or linear-lanceolate to linear, 2.5-4 cm × 2-5 mm, apex acute or acuminate; tube ca. 7 mm. Tubular florets numerous, 1-1.2 cm, extending from involucre; tube 6-7 mm. Achenes cylindric, ca. 6 mm. Pappus pale brown or reddish brown in fruit, as long as tube of tubular corolla. Fl. and fr. Jul-Oct. 2n = 58*.
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