VEGETABLE POWDERS 



363 



J, 



Fig. 108. GRINDELIA. 



a. Epidermis. 



b. Trichomes. 



c. Glandular trichomes. 



d. Epidermis, lateral view. 



e. Pollen grains. 



/. Parenchyma cells with crystals. 



g. Epidermis, lateral view. 



h. Parenchyma. 



i. Parenchyma with aggregate crystals. 



j. Tracheids. 



