VI. — The L eaf— continued. 



No correlation exists between the physical appearance 

 of the Belladonna plant and the alkaloidal content 

 of its leaves 



Real genetic relationships take cognizance of all the 

 characters ......... 



Intramarginal vein ........ 



The angles the secondary or lateral veins make with 

 the midrib 



Ordinary species — 



Longitudinales 

 Obliquae . 

 Transversae 



Hybrid species 



Fossil species 



Variation in different parts of the same leaf 

 Oil glands 

 Resin 



Shape 



Obliquity 



Apex 



Margins 



Twisting of the petiole 



Deciduous leaves 



PAGE. 



387 



388 

 3Q2 



394 



394 

 398 

 406 



407 

 408 

 409 

 410 

 412 

 412 

 413 

 413 

 414 



415 



416 



Explanation of Plates (232-23B) 



417, 418 



