6o8 



BOTANY AND PHARMACOGNOSY. 



TiNNivELLY Senna. From 2.5 to 5 cm. long (Fig. 262, H), 

 upper surface light green, lower surface slightly pubescent. 

 Inner Structure. See Fig. 263. 



Fig. 262. Cassia acutifoUa: E, fruiting branch-, F, a single leaflet; G, a pod. Cassiu 

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



Constituents. Senna leaves contain several glucosides 

 which yield oxymethylanthraquinone compounds resembling those 

 found in aloes and rhubarb ; a glucosidal substance, anthr.\glu- 

 COSENNIN, which occurs as a brown-black powder and yields on 

 hydrolysis senna-emodin (tri-oxymethylanthraquinone) and 



