Slenderleaf False Foxglove, a native species, has been added to the USWildflowers database (10/30/2010.) Scientific name is Agalinis tenuifolia.  Photo below was taken in Blount County, TN on the banks of the Tellico Reservoir of the Little Tennessee River on Oct 16, 2010. 

Slender Gerardia, Slenderleaf False Foxglove – Agalinis tenuifolia