Explanation of PL XIII. 



Tropidia Somai HAYATA 



Fig. 1. The plant. 



2. A flower. 



3. A backward sepal. 



4. Two lateral sepals. 



5. A petal. 



6. A lip, seen from side. 



7. The same, basal portion cut and expanded. 



8. A column; ros.=rostelluni ; a = anther. 



9. An anther with po iuia. 



