Species:
     Apocynum androsaemifolium   (spreading dogbane)  (4 images)
     Apocynum cannabinum   (hemp dogbane)  (13 images)
     Apocynum floribundum   (western or intermediate dogbane)  (13 images)
     Vinca major   (bigleaf periwinkle, great periwinkle)
     Vinca minor   (common or lesser periwinkle)