SENNA 



317 



eter, and in 4- to 6-sided prisms, about 0.015 mm. in length, usually 

 in crystal fibers; stomata broadly elliptical, about 0.020 mm. in 

 length and having two neighboring cells. 



Tinnivelly Senna. From 2.5 to 5 cm. in length, upper surface 

 light green, lower surface slightly pubescent. 



FIG. 142. Cassia acutifolia: E, fruiting branch; F, a single leaflet; G, a pod. 

 Cassia angustifolia: H, a single leaf; J, a pod. After Taubert. 



Inner Structure. See Fig. 143. 



Powder. Dark green, resembling Alexandrian senna, but has 

 relatively few non-glandular hairs. 



Constituents. Senna leaves contain several glucosides which 

 yield oxymethylanthraquinone compounds resembling those found 

 in aloes and rhubarb; a glucosidal substance, anthraglucosennin, 



