364 POWDERED VEGETABLE DRUGS 



104. GUAIACUM. Guaiacum Wood. 

 Fl. ex. 60. Rasped. 



Guajakholz, Pockholz, Franzosenholz, G. Bois de guaiac, Fr. 



The wood of Guaiacum officinale L., Zygophyllacese. 



Olive green. 



Faintly aromatic. 



Nearly tasteless, faintly pungent. 



Medullary rays of a single layer of cells, about six cells high. The 

 predominating tissue consists of very thick-walled wood fibers through 

 which are scattered large resin ducts with olive green, sometimes brown, 

 resin. No starch; prismatic crystals are sparingly present. 



While the wood is rarely if ever adulterated, the resin obtained 

 therefrom is frequently adulterated. 



106. (Fig. 109.) GUARANA. Guarana. U. S. 

 Fl. ex. 60. 



Guarana, G. and Fr. 



The crushed, partially roasted and agglutinated seeds of Paullinia 

 Cupana K., Sapindacese. 



Rather bright reddish brown. 



Faintly aromatic, recalling chocolate. 



Quite bitter, astringent. 



Medium sized to rather large typical, brown or brownish paren- 

 chyma cells filled with pasty starch. Some rather small, brown 

 sclerenchyma cells. Numerous lumps of pasty starch of the dimen- 

 sions of the cell lumen. 



Ash 1.5 per cent. 



Said to be adulterated with starch (cassava starch) and occasion- 

 ally with cocoa seeds. 



