Explanation of PI. XXI. 



Platanthera paclujglossa HAYATA. 



Fig. 1. The plant. 



2. A flower. 



3. The same, seen from side. 



4. The same, seen from back. 



5. Central portion of a flower. 



6. The same in vertical secti9n. 



7. Column, seen from side. 



8. 9. Polliuarmm, seen from different sides. 



