Herbs, mostly erect, infrequently scapose, (0.5-)1-15(-20) × 0.5-3 dm, glabrous or floccose to tomentose, usually greenish, occasionally grayish. Stems spreading to erect, with or without persistent leaf bases, up to 1/ 4 height of plant; caudex stems absent; aerial flowering stems erect to spreading, slender to stout, solid or hollow, occasionally fistulose, 0.3-4(-10) dm, glabrous or lanate to tomentose or floccose. Leaves basal or sheathing up stem 0.5-4 dm; petiole 1-10 cm, glabrous or tomentose; blade oblanceolate to elliptic or ovate, 1-6 × (0.3-)1-4 cm, densely white-lanate or tomentose abaxially, tomentose to floccose or subglabrous to glabrous adaxially, margins plane or undulate-crisped. Inflorescences cymose, rarely umbellate or capitate, 2-100(-150) × 2-40(-80) cm; branches usually dichotomous, glabrous or tomentose to floccose or sparsely pubescent; bracts 3, scalelike, 0.5-3(-5) mm. Peduncles absent. Involucres 1 per node or 2-10 per cluster, turbinate to turbinate-campanulate, (2.5-)3-5(-7) × (1.5-)2-4 mm, glabrous, tomentose, or sparsely pubescent; teeth 5-8, 0.2-0.6 mm. Flowers (1.5-)2-4 mm; perianth white or yellow, sometimes pink or rose, glabrous or pubescent; tepals connate proximal 4, monomorphic, oblong to obovate; stamens exserted, 2-5 mm; filaments pilose proximally. Achenes light brown to brown, 1.5-3.5 mm, glabrous.
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