Explanation of PI. XXI. 



Plat anther a padtyylossn HAY ATA. 



1- The plant. 



2. A flower. 



8. The same, seen from side. 



4. The same, seen from back. 



5. Central portion of a flower. 

 (3. The same in vertical section. 



7. Column, seen from side. 



8. 9. Polliuarium, seen from different sides. 



