Broadleaf Arrowhead, a native species, has been added to the USWildflowers database (10/09/2012.) Scientific name is Sagittaria latifolia.  Photo below was taken in Walker County, GA on Sep 26, 2012.   It  is also known by the common names Common Arrowhead, Arrowleaf, Burhead, Wapato, and Duck-potato.  Go to the Broadleaf Arrowhead detail page for more photos and information.

Common Arrowhead, Arrowleaf, Burhead, Wapato, Duck-potato, Broadleaf Arrowhead – Sagittaria latifolia