Can You Identify This Flower?

When Perry and I first moved into our house, this gorgeous flower grew across the top of our backyard deck.

Fifteen years and one deck demolition later, this small flower continues to make it's presence known each year around this same time. I've attempted to identify what I'm guessing is some variation of a rose but no one seems to know with certainty.

I'd like to know because I plan on planting it everywhere to honor the flower's ability to thrive despite being hacked on by Perry and his minions. Evidently, he didn't like having to weed eat around it...

Challenge accepted.