A genus of mainly perennial herbs with simple leaves which are either in a radical rosette or alternate. The flower heads are stalked, solitary, or in panicles. The herbaceous involucre bracts are numerous and either all of one length or in 2 or more rows, the ray-florets are female and numerous, in 2 or more rows. The disc-florets are bisexual, tubular, and 5-toothed. The achenes are flattened with a pappus of bristles. There are about 200 species, found throughout the temperate regions of the world, but especially in America. Some species are alpine. Many are now naturalized in regions to which they have been introduced.
Subjects: Plant Sciences and Forestry.