"Rhizomatous perennial 3–6 dm; stem villous-tomentose at least above; lvs glabrous or nearly so, linear or lance-linear, 3–10 cm × 2–6 mm, sessile, acuminate, closely and rather shallowly serrate to subentire; heads several or numerous in an open-corymbiform infl, the disk 4–8 mm wide; invol 4–5 mm; rays commonly 8–10, white, 3–5 mm; disk-fls 50–75; 2n=18. Beaches, roadsides, and waste places; native to n. Eurasia, naturalized in ne. Amer. from Lab. to N.Y., w. to Minn. and Mo. July–Sept. Forms escaped from cult. often have numerous rays."