Herbs, perennial, rather robust, rhizomatous. Stem solitary, erect, to 100 cm tall, simple or branching into synflorescences in upper part, obscurely pubescent, glabrescent to glabrous. Basal and lower stem leaves usually present at anthesis, long petiolate; petiole to 19 cm, basally gradually expanded and somewhat sheathing but not auriculate; blade triangular, 13-15 × 10-12 cm, papery, glabrous, pinnately veined, base deeply cordate, margin coarsely obtusely triangular-dentate, apex shortly obtuse-acuminate. Median stem leaves similar, to 18 cm; petiole 12-13 cm, basally auriculate; auricle orbicular or reniform; blade 1.5-4 cm in diam., base semiamplexicaul, margin coarsely dentate. Upper leaves shortly petiolate or sessile, elliptic, ovate, or lanceolate, auriculate, pinnately lobed with a large triangular-lanceolate, attenuate, cuneate terminal lobe and 2-4 spreading, oblong-lanceolate lateral lobes. Uppermost leaves sessile, lanceolate, basally auriculate, margin subentire. Capitula radiate, very numerous, arranged in an abundant, spreading terminal compound corymb, branches and peduncles pubescent; peduncles ca. 3 mm, slender, usually bracteate at base, 2-or 3-bracteolate, bracts and bracteoles linear. Involucres narrowly campanulate, 4-5 × ca. 2 mm, calyculate; bracts of calyculus 4 or 5, linear-subulate; phyllaries 6-8, linear, ca. 4 × 1-1.5 mm, herbaceous, sparsely puberulent or subglabrous, margin narrowly scarious, apically obtuse. Ray florets 3; corolla tube 2.5-3 mm; lamina yellow, oblong, ca. 4 × 1.3 mm, 3-or 4-veined, apically 3-denticulate. Disk florets 7-9; corolla yellow, 5-5.5 mm, with ca. 2.5 mm tube and funnelform limb; lobes ovate-triangular, ca. 1 mm, apically acute, papillose. Anthers ca. 1.5 mm, basally obtuse-auriculate, appendages ovate; antheropodia small, basally slightly dilated. Style branches ca. 0.8 mm. Achenes cylindric, ca. 2 mm, glabrous. Pappus white, ca. 4 mm. Fl. Jun.
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