These photos of Periwinkle [Vinca Minor] were taken on 16 March 2013 and 5 March 2017. The older photos were from Fletcher Park.Newcomb’s Wildflower Guide, pages 256-257, says this is another cultivated flower escaped to roadsides and woods, which is where it was found. Common Periwinkle or Myrtle is a member of the Dogbane (Apocynaceae) family.
USDA Plants Listing: Vinca Minor