Camphorweed, a native species, has been added to the USWildflowers database (01/9/2012.) Scientific name is Heterotheca subaxillaris.  Photo below was taken in Walker County, GA, on October 2, 2011.   It  is also known by the common names Camphor Weed and False Goldenaster.  Go to the Camphorweed detail page for more photos and information.

Camphorweed, Camphor Weed, False Goldenaster - Heterotheca subaxillaris