Swamp Rose Mallow (Hibiscus moscheutos) - Cape May, NJ (Sep. 16, 2006)
http://www.illinoiswildflowers.info/wetland/plants/sw_rsmallow.htm
"In the past, the pink-flowered form of Swamp Rose Mallow that lacks a reddish purple throat was classified as a distinct species, Hibiscus palustris. However, it is now considered one of several color forms of Swamp Rose Mallow."