This is the rarest and smallest of our native Lady's Slippers. I was out last week in eastern Washington at a site I was acquainted with and found a few plants. I checked out another site and didn't find any there. Their common name is Clustered Lady's Slipper or Brownie Lady's Slipper and while the leaves are 4-6 inches across the plants are only a few inches tall and tend to hide under other plants. The flowers vary in color from green to a very deep mahogany.

nativeorchidsofthepacificnorthwest.blogspot.com/2013/05/sixth-week-of-native-orchid-season.html