ILLUSTRATED TERMS. 



Serrate : when the margins have short, sharp teeth which 

 point forward. (Fig. ii.) 



Incised : when the teeth of the margin are coarse and jagged 

 and extend quite far into the leaf. (Fig. 23.) 



Lobed : when the incisions of the margin extend about half 

 way to the midrib and in which case the leaf is spoken of as 

 being three-lobed, five-lobed, or according to the number of 

 lobes that are formed. (Fig. 24.) 



FIG. 17. 



FIG. l8. 



FIG. 19. 



FIG. 20. 



Cleft : when the incisions of the margin reach more than 

 half way to the midrib. (Fig. 25.) 



Divided : when the incisions extend to the midrib. 

 (Fig. 26.) 



The Sinuses of a leaf are the hollows, or curves that are 

 formed between the projecting teeth, or lobes. 



According to the roughness or smoothness of their surfaces, 

 leaves, and in fact, any of the parts of a tree are said to be : 



Glabrous : when the surface is not provided with down, or 

 hairs. 



Pubescent : when provided with fine hairs, or downy. 



Tomentose : when covered with hairs that are matted and 

 woolly. 



Glaucous : when the surface is covered with a powdery sub- 

 stance, waxy in nature, called a bloom. 



