SECT. I. ORGANOGRAPHY AND GLOSSOLOGY. 



65 



58 



vessels here diverge from the extremity of the petiole 

 into several (usually three or five) equally strong nerves, 

 which are afterwards 

 subdivided in a penni- 

 nervedmanner(^.58.). 

 The whole system of 

 venation here resembles 

 that of a compound 

 penninerved leaf, whose 

 leaflets have become 

 grafted together into 

 one limb. This nerv- 

 ation stamps the character of the palmate leaves. 



(c.) Peltinerved. The vessels in this case diverge in 

 a plane which is inclined to the 

 direction of the petiole ; and in 

 proportion as the angle of inclin- 

 ation approaches a right angle, the 

 limb of the leaf is more symmetri- 

 cally formed, round the point where 

 the petiole is attached to it (fig. 59-). 

 Where the angle is acute, the 

 nerves which diverge on the side 

 nearest to the petiole are the short- 

 est, and the limb is proportion- 

 ably contracted. From this nervation originate the 

 peltate leaves. 



59 



(d.) Pedalinerved. In this case there is no decided 



