Southern Stoneseed, a native species, has been added to the USWildflowers database (05/29/2011.)  Scientific name is Lithospermum tuberosum.   It is also known by the common names Tuberous Stoneseed and Tuberous Gromwell.  Photo below was taken on Pigeon Mountain in Walker County, GA on April 2, 2011 while  Jay Clark, author of Wildflowers of Pigeon Mountain, was showing me some wildflower locations.

Southern Stoneseed, Tuberous Stoneseed, Tuberous Gromwell - Lithospermum tuberosum