Erect annual herb, up to c. 2 m tall. Stems sparsely hairy to glabrous, branched above. Lvs glabrous or sparsely hairy on veins below, apetiolate, lanceolate, oblanceolate or narrow-elliptic, cuneate and sometimes amplexicaul, or broad at base, irregularly serrate or with triangular lobes and again serrate, 6-20 × 1-8 cm; uppermost lvs smaller, often lanceolate or linear. Capitula in dense or open panicles. Supplementary bracts 5-14, linear, 3-5 mm long. Involucral bracts 12-15, linear, (8)-11-13 mm long. Disc pale yellow, 5-8 mm diam. Achenes subcylindric, narrowed to apex, 2.5-3.5 mm long, sparsely hairy between ribs; pappus white, 12-15 mm long.
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