86 



PHARMACEUTICAL BOTANY 



These crystals are classified according to form and belong either to 

 the monoclinic or tetragonal system (See Fig. 38). 



A 



V 



B 



FIG. 38. Various forms of calcium oxalate crystals. A, styloids from the 

 bark of Quillaja saponaria; B, rosette aggregate from rhizome of Rheum officinale; 

 C, raphide from the bulb of Urginea maritima; D, crystal fiber as seen in longi- 

 tudinal section in either the xylem or phloem regions of Glycyrrhiza; E, micro- 

 crystals (crystal sand) isolated from the parenchyma of Belladonna root; P, 

 monoclinic prisms; and G, twin-crystals from leaves of Hyoscyamus niger. All 

 highly magnified. 



Crystals belonging to the Monoclinic System and Examples of Drugs 

 Containing them: 



1. Solitary Hyoscyamus, A cer Spicatum, Viburnum Prunifolium. 



2. Rosette Aggregates Althaea, Gossypii Cortex, Stramonium, 

 Granatum, Rheum, Fceniculum, Viburnum. 



3. Columnar (Styloids) Quillaja. 



