Spotted St. Johnswort, a native species, has been added to the USWildflowers database (08/11/2013.) Scientific name is Hypericum punctatum.  Photo below was taken at Lula Lake, Walker County, GA on Aug 3, 2013.  Go to the Spotted St. Johnswort detail page for more photos and information.

Spotted St. Johnswort, Black Dotted St. Johnswort – Hypericum punctatum