CRUDE DRUGS. 



457 



Allied Plants. — Saponin-like substances and methyl sali- 

 cylate are found to a grieater or less extent in other species of 

 Polygala, of which at least forty have been used in medicine. 



Fig. 197. Senega snakeroot (Potygala Senega). Two flowering plants and three large roots. 



Other genera of the PolygalaceEe seem to have constituents 

 similar to Senega, as Comesperma of Australia and Monnina of 

 South America. 



