720 



BOTANY AND PHARMACOGNOSY. 



11. CASTANEA. The cells contain tannin masses, giving a 

 blue color with ferric chloride. (See No. i8, under Senna.) 



12. CHIMAPHILA. Dark green; calcium oxalate in rosette 

 aggregates 40 to 60 /x in diameter ; mesophyll with irregular, red- 

 dish-brown tannin masses. 



13. EUCALYPTUS. Light green ; calcium oxalate in rosette 

 aggregates or monoclinic prisms 15 to 25 /x in diameter; outer 

 wall of epidermal cells about 20 /x thick. In leaves from younger 

 parts of the tree the outer wall of the epidermal cells is 5 to 8 /* 

 thick. 



14. GRANATUM. (See No. 23.) 



Fig. 282. A, transverse section of hyoscyamus leaf showing monoclinic prisms of 

 calcium oxalate, also a twin-crystal; B, longitudinal section of glycyrrhiza showing a 

 crystal fiber, i.e., a row of superimposed cells, each containing a polygonal monoclinic 

 prism of calcium oxalate, the crystal filling the cell. Adjoining the crystal fiber is a group 

 of bast fibers on one side and some cells containing starch on the other. 



B. CALCIUM OXALATE IN MONOCLINIC PRISMS. 



a. GLANDULAR AND NON-GLANDULAR HAIRS PRESENT. 



15. HYOSCYAMUS. Dark green (Fig. 282, A), calcium 

 oxalate in single or twin monoclinic prisms about 10 fi in diam- 

 eter, occasionally in rosette-shaped crystals ; non-glandular hairs 

 numerous, i- to 5-celled ; glandular hairs numerous, of three dif- 

 ferent kinds, stalks i- to 4-celled, glandular heads one- to many- 

 celled (see also Figs. 287, B; 302, A). 



