Didn’t know there was one on that path.
Also known as Halberdleaf rosemallow, Hibiscus laevis All. It’s a forb that grows all over the eastern U.S. and in Ontario. I’ve got one in a pot here on my front porch that I dug up to get it out of the next path mowing. No, they don’t have much of an odor. Yes, they are five-lobed flowers, and they do seem to like disturbed soil. The ones I have are not in a swamp; they’re in upland woods.
Apparently they’re well fed.
It’s been 12 days since they hatched, and supposedly Carolina wrens fledge in 12-14 days, so they could fly any day now.