pet a sites

[Gr. petasités, from petasos =a broad-brimmed hat, or a broad, umbellated leaf, like one.] Bot.: Butter-bur. The typical genus of Petasitese. Perennial herbs, with great broad leaves developing after the flowers. Heads purplish or white; subdiœcio us; corolla tubular; pappus of soft, slender hairs; limb in the male five-cleft; fruit cylindrical, glabrous. Known species ten; one, Pet a sites vulgar is , the Tu ilago pet a sites of Linnæus, is British. The stem is purplish below; the leaves are sometimes three feet in diameter, white, and as if covered with cobwebs beneath. P. alb us is an escape found in shrubberies.