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Ruellia caroliniensis
Woodland north slope
Likely Carolina Wild Petunia (Ruellia caroliniensis). Thank you so much, PucaK, for the identification and lead!
The Carolina Wild Petunia (Ruellia caroliniensis) is the most common wild petunia found in this area. You would need more information to identify to the species level. The reference in the suggested id will help. Another, more detailed site would be - http://www.namethatplant.net/ - and search on Ruellia