Perennials, 30-80(-120) cm. Stems 1, erect, simple or branched (strigose, glabrate). Leaves basal and cauline; petiolate (proximal) or sessile (distal); blades (basal and proximal cauline) mostly elliptic to oblong, 10-20 × 2-8 cm, usually not pinnately lobed (sometimes with 1-4+ lateral lobes near bases), margins ± crenate, faces usually silvery strigose or sericeous (at least when young), glabrescent, ± gland-dotted. Heads (3-)10-60+ in corymbiform arrays. Involucres (3-)5-8(-10) mm diam. (phyllaries 40-60+ in 3-4+ series, tips usually ± dilated). Receptacles flat to convex. Ray florets usually 0 [sometimes 12-15, pistillate, fertile; corollas white, laminae 4-6+ mm]. Disc corollas ca. 2 mm. Cypselae ± columnar, 1.5-2 mm, 5-8-ribbed (with non-mucilaginous glands); pappi coroniform, 0.1-0.4 mm (entire or ± toothed). 2n = 18, 54. Flowering Aug-Sep. Disturbed sites, abandoned plantings; 0-1800 m; introduced; N.S., Ont., Que., Sask.; Calif., Colo., Conn., Del., Idaho, Ill., Ind., Kans., Maine, Md., Mass., Mich., Mo., Mont., Nev., N.H., N.Y., Ohio, Oreg., Pa., R.I., S.Dak., Utah, Vt., Wash., Wis., Wyo.; Asia.