64 NOMENCLATURE OF THE LEAF. 



a. Equal when the two halves of the expansion, are of the same 

 length, as in the cherry-tree and apple-tree. (F. 40.) 



b. I" nequal when the two halves are of different lengths, or one 

 larger than the other, as in the begonia and common lime-tree. ( F 139.) 



18. Margin: The principal characteristic names, 

 used to express the different kinds of margin which 

 leaves have, are derived from the margin being either 

 entire, indented, bordered or rolled. 



a. Entire margins entire, the margin of the leaf uninterrupted, 

 or free from every kind of indentation, as in the wild goafs-beard 

 and purple goafs-beard. (F. 137.) 



b. Indented margins Those in which the margins are not regular 

 and even. The following are the varieties of indented margins: 



Sinuated when it is cut, as it were, into roundish scollops, 

 as in the common oak. (F. 138.) 



Gnawed when the scollops are very irregular, as if formed 

 by the gnawing of some insect. (F. 148.) 



Toothed beset with projecting, horizontal, and rather distant 

 teeth of its own substance, as with the lower leaves of the 

 throat-wort and blue-bottle. (F. 140.) The varieties are 



EqualIy.toothed-(F. 143.) Unequally-toothed (F. 144.) 



Deeply-toothed (F. 149), Obscurely-toothed (F, 141), and 

 Doubly-toothed (F. 142.) 



Serrated or sawed when the teeth are sharp, and lie, as it 

 were, upon each other, as in a saw, all pointing towards the 

 apex of the leaf, as in the common orpine. The varieties are 



Equally,uneqnally,sharply,deeply,doubly and slightly serrated. 



Crenated when the teeth are rounded, and not directed to 

 either end of the leaf, as in the common betony and common 

 scull-cap. The varieties are 



Donbly-crenate the crenatures themselves crenated, as in 

 clary and golden locks. 



Tooth-crenate when the crenatures are of a doubtful form, 

 being neither completely rounded nor yet pointed. (F. 150.) 



Crenulated when they are very shallow, and at the same 

 time, perfect. (F. 151.) 



Spinons when beset with sharp rigid spines, as in the spear- 

 leaved cnicns and common holly. (F. 153.) 



