Boy, those stems on the plants in the links sure look the same. I do know that it wasn't planted recently and has probably been there for years - just never saw it in bloom before. While it's located in oak/hickory woodland, we're only 20 miles or so from the IN dunes where it's considered an invasive. I'd say the height of the tree is probably around 8 to 10 feet. Or it's possible my dad dug it up down around the Kankakee River where he had property.
Should I consider this one solved?