Toxicological trivia from October 15, 2014: Vinca (Latin: vincire "to bind, fetter") is a genus in the family Apocynaceae, native to Europe, northwest Africa and southwest Asia.The English name periwinkle is shared with the related genus Catharanthus (and also with the common seashore mollusc, Littorina littorea). In India the plant is known as sadaphuli meaning "always flowering".Two of the species, Vinca major and Vinca minor, are extensively cultivated as a flowering evergreen ornamental plant. The agent is extracted from this plant:a) vincristine;b) Vinblstine;c) Both previous statements are correct. 

Correct answer: c.  Read more in WP.