Leaf blades 5-75+ × 3-15(-20+) mm. Peduncles 5-3+ cm. Phyllaries: keels stramineous and thickened in fruit, abaxial faces scabrellous or glabrate. Cypselae 1.5-2+ mm. 2n = 18.

Flowering Jun-Sep. Disturbed sites, sandy soils; 10-100 m; introduced; N.S., P.E.I.; Maine, Mich., N.H., N.Y., Ohio, Pa.; Europe.

Plant 5-30 dm, glabrous or minutely granular-hairy; basal lvs oblanceolate or broader, mostly toothed, 0.5-7 cm נ2-15 mm; peduncles conspicuously inflated for some distance below the heads; invol 4-7 mm, its 10-22 bracts narrow; achenes 1.5-2 mm, often slightly rugose as well as strongly ribbed, otherwise glabrous, shining; 2n=18. Fields and waste places; native of Europe, but found occasionally from N.S., N.B., and Me. to Pa., O., and Mich., perhaps not becoming fully established. June-Sept.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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