As best as I can tell, this is Virginia Spiderwort.
We were on our way to Virginia in May 2009 and were camping two nights in west Tennessee. We had taken a drive to see some of the state away from our normal route, Interstate 40. During a break in the rain, we took a hike through the woods at Montgomery Bell State Park.
Virginia Spiderwort – Wikipedia
State of Tennessee – Montgomery Bell State Park