I wouldn't be surprised if they were developed from the wild roses given the appearance of the flower.
I've seen wild roses blooming in the dunes on Plum Island even on cold grey days in October with salty spray blowing in off the waves.
Maybe buy one of the plants and let it go for a year or two without touching it and see what it does? I assume there are certain soil conditions which it prefers, so I have no idea how they would do in Pennsylvania. But they sure like the sandy soil out by the ocean.