Herbs 30-100 cm tall, perennial. Stem solitary, 2-10 mm in diam., erect, apically branched, thinly arachnoid lanate, glabrescent. Lower stem leaves petiolate; petiole 5-17 cm; leaf blade triangular-cordate, 8-15(-25) × 4-14 cm, abaxially pale green and thinly arachnoid tomentose but glabrescent, adaxially green and sparsely strigose, base cordate, margin sharply sinuate-dentate, apex acuminate. Upper stem leaves shortly petiolate; leaf blade ovate to ovate-triangular, gradually smaller upward on stem. Capitula numerous, in a lax paniculiform to corymbiform synflorescence. Involucre campanulate to obconic, (0.8-)1-1.3(-1.5) cm in diam. Phyllaries in 5 or 6 rows, arachnoid or glabrescent, margin and apex usually slightly purple; outer phyllaries ovate, 2-3 × 1.5-2 mm, apex obtuse and mucronate; middle phyllaries oblong to narrowly elliptic, 4-10 × ca. 2 mm, apex obtuse; inner phyllaries narrowly oblong, 10-12 × 1-2 mm, apex obtuse. Corolla purple, 1.3-1.6 cm, minutely gland-dotted, tube 6-9 mm, limb ca. 8 mm, lobes ca. 4 mm. Achene pale brown, cylindric, 3-4 mm, ribbed, glabrous, apex with a short crown. Pappus apically white, basally pale brown; outer bristles 2-4 mm, scabrid; inner bristles 1.2-1.3 cm. Fl. and fr. Jul-Oct.
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