Plants 50-80(-100) cm tall. Stems erect, green or sometimes purple tinged, distinctly striate, glabrous, simple. Basal leaves fallen at anthesis. Lower and median leaves long petiolate; petiole not winged, 3-4.5 cm, glabrous; blade abaxially pale green, adaxially green, broadly triangular, 10-18 × 5-16 cm, 3-5-lobed; lobes triangular, basal lobes sometimes rudimentary, both surfaces glabrous or puberulent on veins, base cuneate or truncate, margin stiffly mucronulate-denticulate, apex acute. Upper leaves shortly petiolate, gradually smaller upward. Uppermost leaf blades ovate-lanceolate, 5-10 × 3-6 cm, apex acuminate. Capitula numerous, terminal or in upper leaf axils in furcate broad panicle; peduncles ascending, 5-15 mm, stout, sparsely pubescent or subglabrous, with 1 or 2 linear bractlets. Involucres narrowly campanulate, 10-12 × 5-10 mm; phyllaries 7 or 8(-10), oblong or oblong-lanceolate, outside glabrous, margin scarious, apically obtuse or rather acute. Florets 8-10; corolla yellow, 7-8 mm, with ca. 3 mm tubular tube and limb; lobes lanceolate. Anthers exserted from corolla, basally caudate. Style branches excurved, obtuse or truncate, papillose. Achenes yellowish brown, cylindric, ca. 6 mm, glabrous, ribbed. Pappus white or reddish brown, ca. 7 mm. Fl. Jul-Aug, fr. Sep.
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