12 



A CHAPTER TO STUDY. 



Peltate, or Shield-Shaped : when the leaf is orbicular, 

 with the petiole attached to the middle. (Fio. 41.) 



Entire Leaves are those in which the margins form an un- 

 broken line. (Fie. 35.) 



Undulate Leaves have margins that are wavy. (FiG. 33.) 



Serrate Leaves have margins with short, sharp teeth that 

 point forward. (FiG. 30.) 



Crenate, or Scolloped : when the teeth are rounded. 

 (FiG. 31.) 



Incised : when the teeth are coarse and jagged and extend 

 deeper into the leaf. (Fie. 34.) 



FIG. 44. FIG. 45. FIG. 46. 



Lobed : when the incisions extend about half way to the 

 midrib ; and in which case the leaf is spoken of as three lobed, 

 five lobed, or according to the number of lobes formed. (FiG. 



42.) 



Cleft : when the incisions reach more than half way to the 

 midrib. (FiG. 43.) 



Divided : when the incisions extend to the midrib. 



Compound Leaves have the blade split into separate parts, 

 the little blades forming leaflets. When the leaflets are ar- 

 ranged similarly to feather-veins they are said to be Pinnate. 

 When arranged as the veins in a palmately-veined leaf they are 

 Palmate. 



Abruptly Pinnate Leaves are those in which the main 

 stalk is terminated by a pair of leaflets. (FiG. 45.) 



