Plants grayish green. Stem erect, purplish red, 33-124 cm tall, 2.5-4 mm in diam. at base, solid, glabrous. Basal leaves petiolate; petiole 8-22 cm, glabrous, below rounded, above flat, middle to distal petioles narrowly winged; leaf blade oblong, ovate, or suborbicular, 8-30 × 5-21 cm, glabrous, pinnately veined, midvein robust, to 5 mm wide, with prominent reticulate lateral veins on both surfaces, base cordate or slightly subtruncate, margin dentate or subentire, apex rounded. Middle to distal stem leaves subsessile, obovate to ovate, 7-16 × 4-11 cm, base semiamplexicaul or tubular-amplexicaul, margin dentate, apex obtuse. Distalmost stem leaves sessile, ovate-lanceolate to linear. Synflorescence racemose, to 30 cm, initially densely clustered, elongating in fruit, lax; leaflike and supplementary bracts linear, less than 1 cm; peduncles unequal, to 6.5 cm, densely shortly yellowish brown pilose. Capitula numerous. Involucre turbinate or subcampanulate, 6-9 × 4-5 mm, outside dark brown, glabrous; phyllaries 6-8, in 2 rows, oblong, 3-4 mm wide, brown ciliate, apex broadly triangular, acute, or shortly mucronate; inner phyllaries broadly membranous at margin. Ray florets 4-6, yellow; lamina oblong, 6-8(-20) × 3-4 mm, apex rounded; tube ca. 3 mm. Tubular florets numerous, 5-6 mm, higher than involucre; tube 2.5-3 mm. Achenes dark brown, cylindric, 3.5-5.5 mm. Pappus yellowish white, as long as tubular corolla. Fl. Jun-Aug. 2n = 58*.
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