Meet the Bearsfoot (Polymnia uvedalia). It's growing all over the place along the Mon River rail trail (at least between Uffington and Opekiska Lock & Dam. Here's one of many links to its description.
If you were to Google the name, most of the links would point you to sites that discuss the medicinal properties of this herb. Among other things, its extract was used for hair tonics.
Insects really seem to like this plant. Below is a Bearsfoot with a couple of Pennsylvania leatherwing beetles (Chauliognathus
pensylvanicus). I think the one on top is trying to help the one on the bottom climb up over the bloom.