The North Carolina Native Plant Society lists this flower as a Nodding Trillium [Trillium rugelii]. it’s a member of the Lily (Liliaceae) family and was found in Gerton on 4 May 2012 with the Large-Flowered Trillium. The USDA link has a name of Ill-scented Wake-robin. Newcomb’s Wildflower Guide, pages 124-125, states that the maroon or dark purple flower can be ill-scented.
USDA Plants Listing: http://plants.usda.gov/java/profile?symbol=TRRU2