234 POWDERED VEGETABLE DRUGS 



25. (Fig. 44.) AURANTIUM AMARUM. Bitter Orange Peel. 



U. S. 



Fl. ex. 40. Tinct. 30. 



Pomeranze, G. Orange amere, Fr. 



The rind of the fruit of Citrus Aurantium var. amaraL., Rutaceae. 



Very light yellowish brown. 



Fragrantly aromatic. 



Pungent, bitter. 



Outer parenchyma of smaller thick walled closely united cells; 

 inner parenchyma cells very loosely united leaving large intercellular 

 spaces; numerous rather large prismatic crystals of calcium oxalate; 

 epidermal cells small, with small yellow pigment granules, oil and 

 prismatic crystals of calcium oxalate. Oil glands destroyed in powder- 

 ing. Vascular tissue deficient. 



Histologically similar to peel of sweet orange, lemon and lime. 



Ash should not exceed 6 per cent. 



Not generally adulterated. The rind of the orange, lemon and 

 limes may be substituted for the rind of the bitter variety. The rinds 

 are often old and wholly worthless and perforated by insect larvae. 



