Rhizomes robust, 1.5-2 cm in diam., with numerous fibrous roots. Stem solitary, erect, green or purple in lower part, striate, 90-200 cm tall, glabrous, long naked in lower part. Leaves long petiolate, lower leaves withered at anthesis; petiole 3-5 cm, not or inconspicuously winged; blade abaxially pale green, adaxially deep green, triangular-lanceolate to lanceolate, 18-20 × 4-8 cm, abaxially sparsely puberulent or subglabrous on veins, adaxially glabrous, base 3-5-veined, lateral veins numerous, upward divaricate, reticulately connected, base truncate or rarely subcordate, apex long acuminate or caudate, lateral lobes excurved or spreading, narrowly triangular-lanceolate, small, sometimes indistinct, margin equally denticulate or triangularly coarsely toothed, teeth long mucronulate. Upper leaves smaller, lanceolate or narrowly lanceolate, lateral lobes very small or inconspicuous, shortly acute. Capitula numerous, terminal and in upper leaf axils in a large divaricately branched panicle; branches spreading or ascending, rachis and peduncles yellow-brown glandular puberulent; peduncles (3-)5-8 mm, slender, with 2 or 3 linear or subulate bractlets. Involucres cylindric, 10-13 × 2-3 mm; phyllaries 5 or 6, green or purple, linear-lanceolate, 10-12 × 1-1.5 mm, outside glabrous or laxly puberulent at base, margin narrowly scarious, apex obtuse or rather acute. Florets 5-8, shorter than involucres or subequal to involucres; corolla yellow, 8-9 mm, with 3-3.5 mm tube and broadly tubular limb; lobes lanceolate. Anthers caudate at base. Style branches not curved, apex truncate, papillose. Achenes yellow-brown, cylindric, 5-6 mm, glabrous, ribbed. Pappus white, 7-8 mm. Fl. Jul-Aug, fr. Sep.
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