26 GENEEAi PRINCIPLES. 



Hound ^ roundisJi^ as tliej approach a circular fonn like 

 fig. 21. Tlie point is often a distinguishing feature, 

 some tei-minating suddenly in a sharp point, others 

 drawn out to a long, shai-p point, peaked^ whilst 

 others are nearly round. They differ much, too, in 

 the form of the base, some are rounded, some sharp, 

 and some heart-shaped. 



Fig^s. 22 to 26, forms of leaves. 22, oval. 23, oblong. 24, lanceolate. 25, ovate. 26, 

 obovate. 



The divisions of the edges are serrated or toothed^ when 

 the edges are cut into sharp teeth, dii-ected towards the 

 point of the leaf; finely (fig. 27) or coarsely (fig. 28) ser- 

 rate^ as these teeth are fine or coarse; doubly serrate^ 

 when the principal division or tooth is subdivided. 

 Orenate (fig. 29), when the divisions are rounded, instead 

 of being sharp like teeth. 



