FORMS OP THE LAMINA. 27 



those of the MaidzurusS (Fig. 17) and Shuro (Tr achy carpus 

 excelsa) (Fig. 21) ; when one-ribbed the venation is said to 

 be Costal-nerved, and when several-ribbed Basal-nerved. 

 t> . „ . „ f Costal-nerved. 



Parallel-veined i _ , 



( Basal-nerved. 

 Among basal-nerved laminae also, some have diverging 

 ribs, as those of the Shuro (Fig. 21) and Icho (Ginkgo 

 biloba), and others converging ribs, as those of the Mai- 

 dzuruso (Fig. 17) and Ine (Fig. 10) ; in the former case the 

 venation is said to be Flabellinerved, and in the latter it is 

 said to be Longitudinal-nerved. 



-,-, f Flabellinerved. 



Basal-nerved \ T ' ,. , 



[ Longitudmal-nerved. 

 All the kinds of venation are represented in the following 

 table. 



Venation- 



(Pinnately Veined. 

 „ , _ i Divergipalmately Veined. 



Palmately Veined \ 



1 Convergipalmately Veined. 



(Costal-nerved. 

 Basal-nerved. .^belUnerved. 



t Longitudinal-nerved. 

 3. FORMS OF TEE LAMINA. 



The lamina is mostly of such a form that it can be divid- 

 ed longitudinally into two similar halves side by side, as 

 those of the Sakura (Fig. 16) and Basho (Fig. 20), but in 

 some cases the halves are not similar, as those of the 

 Shukaido (Begonia Evansiana) (Fig. 22) and Nemu 

 (Albizzia Julibrissin) ; when the halves are similar the 

 lamina is said to be Symmetrical, and when they are not- 

 similar TJnsymmetrical. 



_ f Symmetrical. 



Forms op the laminar _ . . n 



I Unsymmetncal. 

 Among symmetrical laminae, some can be divided again 

 by a lateral (transverse) plane into two similar halves up 



