Perennial erect herbs, whitish woolly or tomentose, often stoloniferous, dioecious or polygamo-dioecious. Leaves alternate, entire, linear to lanceolate or oblong, often decurrent. Heads small, inflat-topped corymbs. Involucre oblong to campanulate, bracts scarious, imbricated in 5-8 series, often whitish, outer bracter shorter, outermost woolly. Receptacles mostly convex, not paleaceous. Corolla of outer florets with filiform, 2- to 4-dentate, style undivided, anthers sagittate at base. Corolla of central florets tubular, 5-toothed, functional staminate; style bifid. Achenes very small, oblong. Pappus bristles 1 series, slender, scabrid, free, caducous.
About 110 species mainly in Asia, a few in North America; about four species in Taiwan.