76 



LEA VES. 



[chap. 



of the blade, nor are they separately jointed to the petiole. 

 The portions of a simple leaf thus divided are called the 

 segments or lobes of the leaf. 



8. Simple tmdivided leaves. — It will be useful practice to 

 try to find leaves which correspond to the various outlines 

 figured below. It will constantly happen that the form of 

 some leaves may be as correctly describarl bv one term as 



Fig. 45. Simple Leaf. Fig. 46. CompounJ (pinnate) l,e.if. 



by another ; and again, some leaves vary so much on th«* 

 same branch that they may be found to match two, three, 

 or more of the outline figures. In describing such leaves 

 you must use the terms which denote the usual extremes of 

 variation, as " leaves varying from lanceolate to ovate," or 

 from " oblong to elliptical," &c. The terms may also be 

 combined when needful, as oval-oblong, linear-lanceolate. 



9. Simple divided leaves. — We may class these under two 

 series — viz. (i) those in which the segments radiate from 

 the extremity of a petiole, and (2) those in which they are 



