Clematis is a genus of about 380 species within the buttercup family, Ranunculaceae. Their garden hybrids and cultivars have been popular among gardeners, beginning with Clematis 'Jackmanii', a garden staple since 1862. More cultivars are being produced constantly, mainly of Chinese and Japanese origin.
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Clematis in the context of Ranunculaceae
Ranunculaceae (/rənʌŋkjuːˈleɪsiˌaɪ, -siːˌiː/ rə-nung-kew-LAY-see-e(y)e, buttercup or crowfoot family; Latin rānunculus "little frog", from rāna "frog") is a family of over 2,000 known species of flowering plants in 43 genera, distributed worldwide.
The largest genera are Ranunculus (600 species), Delphinium (365), Thalictrum (330), Clematis (380), and Aconitum (300).
View the full Wikipedia page for Ranunculaceae