Narrowleaf Vervain, a native species, has been added to the USWildflowers database (02/06/2013.) Scientific name is Verbena simplex. Photo below was taken at along the Blue Hole Road at Pigeon Mountain, Walker County, GA , on Jul 15, 2012. Go to the Narrowleaf Vervain detail page for more photos and information.

Narrowleaf Vervain, Simple Verbena – Verbena simplex