Hibiscus or not Hibiscus?

I’ve always been told that this lovely flower growing in our wetland marsh is a Swamp Hibiscus. But it looks a lot like the Turk’s Cap Mallow, a related plant, pictured in my wonderful Audubon Field Guide to Florida and featured as a shade plant in other sources: https://gardeningsolutions.ifas.ufl.edu/plants/ornamentals/turks-cap.html, and https://nativebackyards.com/turks-cap/
Can anyone help me out with this ID?

18 thoughts on “Hibiscus or not Hibiscus?

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