It is a northern plant, read more about it on Wiki ..
http://en.wikipedia.org/wiki/C...
It might be a Cypripedium, it might not, time will tell. Plants can grow out of their natural regions in the right conditions, look at the distribution of all Cypripedium but these plants are likely to have been planted.
http://luirig.altervista.org/f...
I couldn't quite fit the leaves into any of the other genera which it resembles.