VI.-- The Leaf. 



A.— JUVENILE LEAF. 

 (Continued from Part LV, page 251), 



Historical . 



Size 



Shape 



(a) Linear series 



(b) Orbicular series 



The angles the secondary veins make with the midrib- 



(a) Normal species 



(b) Hybrids 



Isoblasticity, Heteroblasticity 



Diels's Law 



The Petiole : — 



(a) Its presence 



(b) Its absence 



Connate or perfoliate . 

 Fusion of leaves by margins 

 Decurrenee of leaf 

 Angularity of branchlets 



Texture 



Vestiture (glands and hairs) 



Lustre 



Glaueousness «... 

 Colour .( Anthocyanin) . 

 Caoutchouc 



Anatomy 



Species of which the Juvenile leaves are wanting 



Explanation of Plates (228-231; 



PAGE. 

 28l 

 289 

 291 

 291 

 291 



294 

 299 



299 

 303 



308 

 312 



314 



314 



3^5 



315 

 3l6 



320 



323 



328 



331 



335 



336 



339 

 339 



