Rattlesnake Master, a native species, has been added to the USWildflowers database (10/28/2013.) Scientific name is Eryngium yuccifolium. Photo below was taken along Ascalon Road, Walker County, GA on August 4, 2013.  Go to the Rattlesnake Master detail page for more photos and information.

Rattlesnake Master – Eryngium yuccifolium