Etymology
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clematis (n.)

plant genus, mostly herbaceous climbers, 1550s, "periwinkle," from Latin clematis, from Greek klematis, in Dioscorides as the name of a climbing or trailing plant (OED says probably the periwinkle) with long and lithe branches, diminutive of klema "vine-branch, shoot or twig broken off" (for grafting), from klan "to break" (see clastic).

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Definitions of clematis

clematis (n.)
any of various ornamental climbing plants of the genus Clematis usually having showy flowers;
From wordnet.princeton.edu