Nice. Is the one in the second photo much smaller than the others? It looks to me like var. makasin, compared to the first photo, which looks like var. pubescens. The third one I would say is also a pubescens.
Actually the first one is very small...only 1/3 the height of the other two. Otherwise all have flowers of similar size. I have yet to see the planipetalum form here.
Very interesting. I was only talking about the flower, though. Plant height is not an accurate way of distinguishing the varieties. Cypripedium parviflorum is a very complicated species.