Whorled Yellow Loosestrife[Lysimachia quadrifolia] found near mile marker 437 on the Blue Ridge Parkway on 25 July 2013. It’s a member of the Primrose (Primulaceae) family. Newcomb’s Wildflower Guide, pages 266-267, says it blooms in summer in woods, thickets, and on shores. USDA Plants Listing: Lysimachia quadrifolia
