150 



BUDS AND LEAVES 



LEAVES 



Origin. Leaves originate at the nodes from the leaf buds. 

 The conducting strands of the veins are branches of the con- 



FIG. 87. Typical Leaf. Willow (Salix cordata); 1, stipules; 2, petiole; 3, 

 base; 4, margin; 5, apex. 



ducting strands of the stem and the leaf epidermis appears 

 as a continuation of the epidermis of the stem from which it 

 originates. The tissues of the leaf are modified and arranged 



