468 



BOTANY AND PHARMACOGNOSY. 



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

 recognized, depending upon the proportion of wood and bark in 



-K 

 K_ 



Fig. 202. A, transverse section of the root of Apocynum caM«abi«Mm showing cork 

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

 fibers (SF), trachese (T), and medtdlary rays (MR).- B, transverse section of the root of 

 Apocynum androscsmifolium 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). 



