Stem erect, to 120 cm tall, 8-15 mm in diam. at base, proximally glabrous, distally and synflorescence initially shortly pilose and white arachnoid-puberulent, glabrescent. Basal leaves petiolate; petiole 7-25 cm, white arachnoid-puberulent, base sheathed; leaf blade ovate or ovate-oblong, 19-40.5 × 8.5-23 cm, both surfaces sparsely white arachnoid-puberulent or glabrescent, pinnately veined, midvein strong, to 1.2 cm wide, lateral veins spreading, base truncate or cuneate, margin regularly denticulate, between teeth ciliate, apex obtuse. Middle to distal stem leaves smaller distally, sessile, sheath amplexicaul; leaf blade ovate-oblong or ovate-lanceolate, to 20 × 9 cm. Compound corymb branched; branches to 23 cm, spreading or fasciated; leaflike and supplementary bracts smaller, linear-subulate; peduncles 0.5-4 cm. Capitula 6-23, rarely more (to 40). Involucre hemispheric or broadly campanulate, 1-1.2 × ca. 2 cm, outside white arachnoid-puberulent; phyllaries 8-14, in 2 rows, ovate-lanceolate or lanceolate, to ca. 7 mm wide, subleathery, apex acute, often curved; inner phyllaries broadly membranous at margin. Ray florets yellow; lamina linear-oblong, 1.5-2 cm × 3-4 mm, apex acute; tube ca. 7 mm. Tubular florets numerous, 1-1.1 cm; tube ca. 5 mm; limb narrowed at base. Achenes brown, cylindric, 3-6 mm. Pappus reddish brown or yellowish, as long as tubular corolla. Fl. and fr. Jul-Oct.
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