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I was taking a break from working and this butterfly decided to take a break too. It may be a polydamus, I've only ever seen them come to rest on the pipevines.
You are right, it is a Polydamus. It lays it's eggs on the Pipevine and that is why you see it there so much. If people take note of where they find a caterpillar (what kind of plant) you can always tell pretty much what kind of butterfly it will be.