WordNet (r) 3.0 (2006):

red periwinkle
    n 1: commonly cultivated Old World woody herb having large
         pinkish to red flowers [syn: periwinkle, rose
         periwinkle, Madagascar periwinkle, old maid, Cape
         periwinkle, red periwinkle, cayenne jasmine,
         Catharanthus roseus, Vinca rosea]