Herbs 40-80 cm tall, biennial. Stem erect, branched from middle third or above, glabrous. Basal and lower cauline leaves linear, 15-30 × 0.2-0.5 cm. Capitula solitary to few; peduncle not inflated, 3-5 mm in diam. Involucre 2.5-3.5 cm. Phyllaries 7 or 8(or 9), equaling or longer than florets, equaling or shorter than achenes with pappus. Ligules yellow, often light blue when dry. Outer achenes 1.8-2.2 cm; body pale brown, ± curviform or almost straight, 1.5-1.8 mm in diam., with 5 fairly well-differentiated ribs, tuberculate; beak whitish, 7-10 mm, abruptly differentiated from body, slender, non-tuberculate or toothed, apically ± inflated; pappus disk pubescent. Pappus dirty white, 1.5-2 cm. Fl. and fr. Jun-Aug.
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