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

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



Constituents. — Senna leaves contain several glucoside? 

 which yield oxymethylanthraquinone compounds resembling those 

 found in aloes and rhubarb; a glucosidal substance, anthraglu- 

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

 hydrolysis senna-emodin (tri-oxymethylanthraquinone) and 



