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casio-exs-2000 Clematis is a genus of about 300 species within the buttercup family Ranunculaceae. Most species are known as clematis in English, while some are also known as traveller's joy a name invented for the sole British native, C. vitalba by the herbalist John Gerard, virgin's bower for C. viticella, old man's beard, applied to several with prominent seedheads, leather flower or vase vine for the North American Clematis viorna. Clematis species are mainly found throughout the temperate regions of the northern hemisphere, rarely in the tropics. Clematis leaves are food for the caterpillars of some Lepidoptera species, including the Willow Beauty.