VI. — The I eaf— continued. 



PAGE. 



No correlation exists between the physical appearance 

 of the Belladonna plant and the alkaloidal content 



of its leaves 387 



Real genetic relationships take cognizance of all the 



characters 388 



Intramarginal vein 392 



The angles the secondary or lateral veins make with 



the midrib 394 



Ordinary species — 



Longitudinales 394 



Obliquae 398 



Transversae , 406 



Hybrid species . 407 



Fossil species 408 



Variation in different parts of the same leaf . . 409 



Oil glands 410 



Resin 412 



Shape 412 



Obliquity 413 



Apex 413 



Margins 414 



Twisting of the petiole 415 



Deciduous leaves 416 



Explanation of Plates (232-238) . . 417, 418 



