Listera
                      species   "Twayblade orchid"   
                  
The only place
                    in Yellowstone that I have found a twayblade orchid is on
                    the South rim trail from Artist's Point in the Canyon area.
                    So if you find one, please drop me a note! I have also found
                    an individual of this species in northern Montana, in the
                    Great Bear Wilderness, Flathead National Forest. I was
                    unable to identify the species because the one individual I
                    found was making seed pods.   
                  
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Location:
                      Artist's Point trail on the south rim of
                      Canyon.   
                  
Blooming:
                      mid-July.  
                  
Sniff
                      test: Not found in
                      bloom!
                    
