any of a genus (Clematis) of perennial plants and woody vines of the buttercup family, with bright-colored flowers of varying size and form
See clematis in American Heritage Dictionary 4
(klĕmˈə-tĭs, klĭ-mătˈĭs)
noun
Any of various ornamental, mostly climbing plants of the genus Clematis, native chiefly to northern temperate regions and having showy, variously colored flowers or decorative fruit clusters.