Swamp Rose Mallow, a native species, has been added to the USWildflowers database (07/26/2013.) Scientific name is Hibiscus moscheutos.  Photo below was taken in Amnicola Marsh in Hamilton County, TN on July 20, 2013.  Go to the Swamp Rose Mallow detail page for more photos and information.

Swamp Rose Mallow – Hibiscus moscheutos