Round-Leaved Tick Trefoil, a native species, has been added to the USWildflowers database (09/09/2013.) Scientific name is Desmodium rotundifolium. Photo below was taken in Walker County, Ga on Sep 5, 2013.  Go to the Round-Leaved Tick Trefoil detail page for more photos and information.

Round-Leaved Tick Trefoil – Desmodium rotundifolium