TABLE 3 



TAXONOMICALLY USEFUL LEAF STRUCTURAL FEATURES OF THE 



CULTIVATED COCAS (ERYTHROXYLUM SPP. & VARS.) 



Character 



Prominence of central panel* 



Leaf venation patterns 



Adaxial crest above midvein* 



Presence and nature of midvein 

 fibrous sheathing (pericycle) 



Veinlet termination numbers* 



Guard cell length* 



Stomatal density and frequency* 



Leaf thickness 



Utility 



Typologically useful; most variable 



among leaves of TrujiUo coca, 



Typologically useful (see Table 4) 



Limited value typologically. 



Typologically useful; most variable 

 in Trujillo coca. 



Ecologically and biometrically 

 variable within each variety. 



Ecologically and biometrically 

 variable within each variety 



Ecologically and biometrically 

 variable within each variety 



Ecologically and biometrically 

 variable within each variety 



♦indicates characters which are most reliable when used with other morphologicaL 

 ecological and geographic data. 



322 



