periwinkle

In botany, any of various plants of the genus of the dogbane family. The lesser periwinkle (), which has small lilac-blue flowers, is a dependable, trailing, evergreen perennial that is native to Europe and has become widespread over much of eastern North America. The greater periwinkle (), with larger leaves and larger purplish-blue flowers, is native to continental Europe and has become naturalized in England. Alkaloids derived from the periwinkle plant have had some success in inhibiting cancer growth.

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