POWDERED DRUGS AND FOODS. 



721 



b. ONLY NON-GLANDULAR HAIRS PRESENT. 



16. CARDAMOMUM. (See No. 43.) 



17. HAMAMELIDIS FOLIA. Dark green ; calcium oxalate 

 in monoclinic prisms 7 to 20 /x, in diameter, frequently in crystal 

 fibers; non-glandular hairs i-celled. about 0.5 mm. long, more 

 or less curved, thick-walled, with yellowish-brown contents, 

 arranged in groups of about fifteen, and spreading from the base ; 

 mesophyll with irregular tannin masses ; sclerenchymatous fibers 

 thick-walled, lignified and with simple pores. 



Fig. 283. Forms of non-glandular hairs: A, twisted hairs from under surface of 

 leaf of eriodictyon; B, lignified hairs from the epidermis of nux vomica; C, branching 

 hairs from the leaf of mullein {Verbascum thapsus). 



18. SENNA. Light green (Figs. 263; 284, D) ; non-gland- 

 ular hairs o.i to 0.2 mm. long, i-celled, thick-walled, the wall of 

 the upper part strongly cutinized, with nunierous slight centrif- 

 ugal projections ; calcium oxalate in rosette aggregates, or occa- 

 sionally in monoclinic prisms, 10 to 20 ix in diameter; fragments 

 colored reddish with potassium hydrate solution. 



The powder of Indian senna (Cassia angusttfolia) is dark 

 green and has relatively few non-glandular hairs. In the powder 

 of Argel Leaves (Solenostemma Argel, Fam. Asclepiadacege) the 

 non-glandular hairs are 3- to 4-celled. In the leaves of Castanea 

 dentata (Fam. Fagacese) the non-glandular hairs are relatively 

 few, 0.2 to 0.5 mm. long, nearly smooth, thick-walled, occasionally 



46 



