White Crownbeard, a native species, has been added to the USWildflowers database (09/20/2010.)  Scientific name is Verbesina virginica.  Other common names are Frostweed, Iceplant, Iceweed, Virginia Crownbeard, Indian Tobacco, Richweed, and Squawweed.  Photo below was taken in Walker County, Ga on Sep 6, 2010.

White Crownbeard, Frostweed, Iceplant, Virginia Crownbeard - Verbesina virginica