492 POWDERED VEGETABLE DRUGS 



184. (Fig. 176.) SENNA. Senna. U. S. 

 Fl. ex. 30. 



Alexandriasenna, E. Sennesblatter, G. Feuilles de se*ne, Fr. 



The leaflets of Cassia acutifolia Delile, and C. augustifolia Vohl, 

 Leguminosse. 



Light yellowish green. 



Somewhat fragrant. 



Slightly bitter; mucilaginous. 



Epidermal cells polygonal, cuticle quite thick with cuticular 

 markings. Stomata on both surfaces. Simple, single celled, thick- 

 walled trichomes with distinct cuticular markings. Crystals present. 



Ash 10 per cent. 



Ash of senna sif tings 17 per cent. 



Adulterated with leaflets of various related species and leaves of 

 other plants. India senna is histologically closely similar to African. 

 Trichomes longer and more numerous; as a rule each stoma is enclosed 

 by two neighboring cells of unequal size, which is much less commonly 

 the case in Alexandria senna. 



