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Annual or biennial to 0.9 m high. Stems with dense adpressed arachnoid hairs; wings absent. Cauline leaves elliptic, pinnatisect to bipinnatisect, silvery-grey above and below, with dense persistent adpressed arachnoid hairs; sessile glands present. Capitula solitary, pedunculate; involucre broadly ovoid, 11–15 mm diam. at anthesis; median involucral bracts broadly elliptic, 5–9 mm long, 2.5–4 mm wide, with sparse arachnoid hairs; appendages 1–1.5 mm long, brown, with 5–8 pairs of stiff marginal cilia. Florets purple; inner (fertile) florets with tube 13–15 mm long, glandular, and lobes 4–5.5 mm long; sterile florets longer than fertile florets. Anthers 7.5–8.5 mm long. Achenes ellipsoid, 3.6–4.3 mm long, sparsely tomentose, grey. Longest pappus bristles 2–2.5 mm long, white.
