Herbs, perennial, 30-100(-300) cm tall; rhizomes long, slender. Stems erect, simple, sometimes branched in upper part, finely striate, glabrous or glabrate or sparsely strigillose proximally, strigillose distally, minutely stipitate glandular below leaves. Leaves cauline, gradually reduced upward, abaxially pale green, adaxially green, shiny, abaxially glabrous, minutely stipitate glandular in pits, veins sparsely strigillose, adaxially scabridulous, margin sparsely ciliate, midvein prominent abaxially, apex acuminate, mucronate; lowest leaves withered by anthesis, shortly winged petiolate; blade obovate to oblanceolate, 0.7-9 cm, base attenuate, margin serrulate to coarsely serrate; lower to upper leaves shortly petiolate (petiole 0.2-0.5 cm); blade oblanceolate to narrowly lanceolate, 3-14 × 0.5-3 cm, base cuneate-rounded to rounded, margin serrate; synflorescence leaves shortly petiolate, lanceolate, 1.5-6 × 0.3-1.2 cm, base rounded, margin 1-5-serrate. Capitula 17-150 or more in terminal paniculate-corymbiform synflorescences; peduncles 3-10 mm, strigillose; bracts lanceolate, entire. Involucres cylindric-campanulate, 4.5-7 mm; phyllaries 5-7-seriate, unequal, green distally, ca. 1 mm wide, apically minutely stipitate glandular, margin scarious, erose, purplish, ciliate, midvein more pronounced distally, ± translucent, apex rounded, erose, purplish, ciliate; outer phyllaries broadly ovate, ca. 1 mm; middle phyllaries oblong, 2-3 mm, base hardened; inner phyllaries oblong, 4-5 mm. Ray florets 8-17, white, tube hairy, lamina 3.5-5(-7) × 1-1.5 mm, eglandular; disk florets yellow, 5.5(-6) mm, tube base flared, tube apex and limb base hairy and sparsely minutely stipitate glandular, limb campanulate, ca. 3 mm, lobes spreading, narrowly triangular, ca. 2 mm, glabrous, eglandular. Achenes mottled purple, oblong, slightly compressed, 2-2.5 mm, strigillose, eglandular, 2-ribbed. Pappus 3-seriate, white or (innermost) ± reddish; outermost bristles few, 0.5-0.7 mm; inner bristles ca. 4 mm, acute; innermost bristles ca. 4.2 mm, weakly clavate. Fl. and fr. May-Dec. 2n = 18*.
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