periwinkle

Periwinkles are a member of the family Apocynaceae, commonly known as the Dogbane family that contains two genii Catharanthus G. Don or periwinkle P which contains one species Catharanthus roseus (L.) G. Don or Madagascar periwinkle P and Vinca L. or periwinkle P that has three species Vinca herbacea Waldst. & Kit. or herbaceous periwinkle P, Vinca major L. or big leaf periwinkle P and Vinca minor L.