STEM APPENDAGES. 



103 



leaf-stalk, or petiole. The petiole is attached to the base, 

 of the blade, and the opposite point is the apex. The gen- 

 eral outline of grape leaves is more or less heart-shaped* 



Fig. 30. THE OPOKTO. 



The Oporto (Fig. 30) is round, heart-shaped ; the Nebraska 

 (Fig. 31), acuminate or pointed-heart-shaped; while the 

 Scuppernong (Fig. 32) is scarcely heart-shaped at all, but 

 nearly orbicular. The edges of the leaves are variously 

 notched, and these markings, as well as the general shape, 

 are of importance in distinguishing species and varieties. 

 It will be seen, by comparing the different figures of grape 

 leaves, that the notches differ not only in shape but in 

 depth. These divisions upon the margin when small, and 

 shaped like those in the leaf of the Oporto, are called teeth, 

 and such leaves are said to be dentated or toothed ; here 



