240 RHIZOMES AND BOOTS. 



(115) Undulated Ipecacuanha. 



The root of Richardsonia sp. (N.O. Rubiacese). 



It is occasionally substituted for the root of Psychotria 

 Ipecacuanha, but may be distinguished by the abundance of 

 starch grains, most of which are larger than those of Brazilian 

 Ipecacuanha and differ a little in shape. The wood is charac- 

 terised by the presence of pitted vessels and wood fibres, both of 

 which are absent from the genuine drug. By these means the 

 presence of undulated ipecacuanha in the genuine drug may be 

 detected without difficulty. 



