in botany, a genus of the syngenesia polygamia superflua clas. The receptacle is naked; the papillae are simple; the scales of the calyx are equal, and somewhat membranaceous. There are nine species; three of them natives of Britain, viz. the farfara, or common colt's foot; the hybrida, or long-flanked butter-bur; and the petasites, or common butter bur.

The common colt's foot stands recommended in coughs and other disorders of the breast and lungs.