Herbs 40-100 cm tall, perennial. Rhizome stout. Stem solitary, erect, apically branched. Basal and lower stem leaves petiolate; petiole 10-25 cm; leaf blade ovate to triangular-ovate, ca. 14 × 10 cm, both surfaces green and glabrous or strigillose, base truncate to cordate, margin sharply dentate, apex acuminate. Median stem leaves petiolate; petiole 1.5-3.5 cm; leaf blade gradually smaller upward on stem, ovate to triangular-ovate, 4-6 × 2-4 cm. Upper stem leaves petiolate; leaf blade narrowly ovate, base cuneate-attenuate. Capitula numerous, clustered 3-6 at end of branches in a corymbiform-paniculiform synflorescence, pedunculate. Involucre campanulate to obconic, 5-9(-15) mm in diam. Phyllaries in 6 or 7 rows, arachnoid lanate; outer and middle phyllaries narrowly ovate to narrowly ovate-elliptic, 3-10 × 1-2 mm, margin apically crenate-dentate, apex herbaceous, acute, and reflexed; inner phyllaries linear, 8-10 × 1.5-2 mm, apex obtuse and erect. Receptacle bristles subulate, 4-6 mm. Corolla purple or white, 1-1.2(-1.5) cm, tube 6-7 mm, limb 5-5.5 mm, lobes 3-3.5 mm. Achene brown, ca. 3 mm, smooth, glabrous. Pappus straw-colored; outer bristles 2-4 mm; inner bristles 7-9 mm. Fl. and fr. Jul-Sep.
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