The 3rd looks like Buttonbush Cephalanthus occidentalis The 1st may be New York IronWeed Vernonia noveboracensis
You are right on. Thanks so much. The 2nd one that pierrot suggested is butterfly pea does look just like it. I read that it is hardy to zone 10-11 and I am zone 7. This plant is located in a nature area maintained by our parks. Either it has naturalized or this isn't the correct plant since I know for certain it wasn't planted by someone. Thanks for the replies.
Clitoria ternatea is a tropical member of the genus. There are temperate members as well. The one pictured is likely Clitoria mariana. And Pierrot...that's an unflattering name? ;-)