PLATE 40 



Annular and Spiral Vessels 



1. Pumpkin stem {Cucurbita pepo, L.). 



2. Two characteristic views of spiral vessels. 



3. (.4) Upper part of spiral vessel in focus. 

 (B) Under part of spiral vessel in focus. 



4. Spiral vessel of the disk petal matricaria {Matricaria 

 chamomilla, L.). 



