Leaf blades 35-120(-180+) × 10-50(-80+) mm. Peduncles filiform, 5-25+ mm. Involucres 7-11+ mm. Phyllaries: abaxial faces glabrous. Cypselae: bodies 2.5-3 mm, beaks 0.5-1 mm; pappi: outer 0.1-0.2 mm, inner 5-6 mm. 2n = 18. Flowering Jun-Oct. Disturbed sites, openings in mixed forests, calcareous or sandy soils; 10-400 m; introduced; B.C., Ont., Que.; Maine, Mass., Mich., Minn., N.H., N.Y., Oreg., Vt., Wash.; Europe.