Turk’s-Cap Lily[Lilium superbum] found near mile marker 437 on the Blue Ridge Parkway on 25 July 2013. It’s a member of the Lily (Liliaceae) family. Newcomb’s Wildflower Guide, pages 352-353, says it blooms in summer in damp meadows and borders of bogs. This resembles a Tiger Lily, but the leaf structure is a whorled pattern.
USDA Plants Listing: https://plants.usda.gov/home/plantProfile?symbol=LISU