Clustered Lady Slipper, Clustered Lady's Slipper: Cypripedium fasciculatum (Synonym: Cypripedium knightiae) - The 2 leaves are nearly opposite and broadly opposite. The 2-4 flowers are densely purplish to brownish spotted on a greenish base and found in a dense terminal cluster.
Mountain Lady Slipper, Mountain Lady's Slipper: Cypripedium montanum - More than 2 stem leaves are found on the plants, and these are noticeably alternate. The lower lip of the flower is large, white or purplish-tinged or purplish-streaked. The long, spreading sepals are a deep purplish-brown.