TAXONOMY 



iND CLASSIFICATION. 



81 



if leaf diagnosis can be relied 



ip'-n (which, however, is very doubtful), 



'■Artocarp 





Cretaceous period ! Highly 





evolved Monoeotyled. 













By the upper Greta 

 dominant ! Before t 



TlZe 



epoch the Angiosperms were 



;;';;; ; i,l > 







nt has yielded up 













ledons. The Monocot 





are placed first i. 





but it would appear t 





e Dicotyledons which arc near 







;x':, 







209. The wood of tl 



yledons exhibits in its -eneral s 











nblance 



i" that of the Gyninnsp.-niK 



- - 



The main difference is in tin 



general 



MJyn 



-t (.iymnosperins The leaves of Cm-Unn an very di<-otyle.lo 

 appearance, tin. null in the continuous plate-like medullarv ra\ 

 [' vascular bundles are also gymnospermous in character. 

 210. The inflorescence and flowers of the Gnetales are very diffe 

 to that of most Gymnosperms, and appear to partake of the chara 

 2n n6 T grOUPS ° f I>icot >' ledons classed by Engler as primitive. 



t appear as the style 

 of a single ovule. Tl 



S Imlocy. the i 



rudimentary perianth which i 



ial \\ .■ might consider 



iperau formed 



en - ? integument, hut much produced. It is, however, just 

 onceivable that the neck of the outer integument or of one of the 

 uter sacs, by growing up similarly to that of the inner 



and gradually a b,: ,,. i„,. n , mode of on. ■. 



Dhvu me ovaries - 0ne or both these outer sacs may be a single sporo- 

 • ■ndency in the 



**us for cataphyllary leaves to become connate, as is seen in the 



