468 



BOTANY AND PHARMACOGNOSY. 



thagena Ipecac. Two commercial sub-varieties of Ipecac are also 

 recognized, depending upon the proportion of wood and bark in 



Fig. 202. A, transverse section of the root of Apocynuni cannabinum showing cork 

 (K); latex cells (L) in the cortex; sieve (S), beneath which is the cambium zone; wood 

 fibers (SF), trachea; (T), and medullary rays (MR). B, transverse section of the root of 

 Apocynuni androsccmi folium showing in addition groups of stone cells (St) in the cortex. 



the drug. Specimens in which the wood is more pronounced are 

 known as " wiry roots," while those which are characterized by a 

 thicker bark are called " fancy " or " Bold " roots (p. 379). 



