LEAVES. GEXEUALLV. 69 



Bipinnate, fig. 12. 

 Tripinnate, fig. 13. 



A common leaf-stalk is frequently mistaken 

 for a branch. The two surfaces, however, of a 

 leaf-stalk, viz. a front, which is either Hat or hollow, 

 and a back, which is mostly convex, will always 

 distinguish it from the branch, which is alike on 

 both sides. 



A leaf is termed 



Obtuse, when it terminates obtusely, fig. 9, 



pi. 29. 

 Acute, fig. 10. 

 Acuminate, fig. 11. 

 Emarginate, fig. 12. 

 Retuse, fig. 13. 



The margin of a leaf is either 



Entire. 



Ciliated, fringed with soft hairs. 



Serrated, edged with sharp teeth, like those of 



a saw, pointing towards the extremity of the 



leaf, fig. 1, pi. 31. 

 Doubly serrated, fig. 2. 

 Crenate, fig. 3. 

 Spinous, beset with thorns, as in the Holly, fig. 4 ; 



or prickles, as in the Butclier's-broom, (Ruscus 



Aculeatus.) ' 



