I08 PLANT ORGANS OR PARTS OF PLANTS. 



fours. The hilum is centric, the margins rounded. In 



Fig. 21. — Sections of Ipecacuanha. 

 I. Cross-section showing corky epidermis: P, Parenchyma, with 

 starch; b, sieve tube groups; h, woody portions made up of tracheids. 

 2. Parenchyma cut long. 3. Longitudinal section of tracheids (Vogl) . 



many cases compound granules are observable ; in these 

 compound granules the size of the different granules 



