DIFFERENT FORMS OF LEA VES. 



CHAPTER XVIII. 



DIFFERENT FORMS OF LEAVES. 



You have already 

 learnt the difference 

 between [simple and 

 compound leaves 

 (p. 22), and we will 

 take the simple leaves 

 first. If the leaf is 

 long and narrow, like 

 a pin or needle, it is 

 called acicular, from 

 the Latin word 

 acicula, a needle. If it is 

 round like a penny, it 

 is called orbicular or 

 circular. There arc 

 manv leaves which arc 



Fig. 60. A Thistle (Cardinis) with 



spiny leaves. between these two 



forms varying from the shape of the needle to that 

 of the penny, and these are called linear (Figs. 

 13, p. 16; 174), oblong, oval, elliptical, and 



