Photos were really really really nice!
Cleome hassleriana (South American Spider Flower)
Ornamentals aren't my forte per se but that was a popular one that was probably just escaping you for the moment. I have lots of plant IDs escaping me lately and I know I know them but for the life of me the names won't pop into my head.
You've probably got a cultivar of the straight species. I looked online and only came up with two possibilities, a 'Purple Queen' and a 'Violet Queen'. I tried to find information on what sets the two cultivars apart from the straight species but came up empty handed. Sorry about that. There are probably more cultivars that have been released by now.
Map of its distribution on North America-
I don't grow this plant but by the looks of the above, it might be an aggressive re-seeder.