144 



LEAVES 



protecting scale (stipule). Note the stipular scars which 

 surround the stem at each node. Collect, press, mount, and 

 label a card of stipules. 



129. LEAVES 



Object. To learn something of the framework of 

 leaves. (a] Parallel Veining, (b }Net Veining. 



(a) 

 Apparatus. Leaves of grasses, lilies, calla, canna, banana, etc. 



Method. Examine the leaves chosen and make out 

 the fact that the framework of these leaves is alike in the 



general parallelism of the 

 veins. Arrange them in 

 two groups, according to 

 the direction of their veins, 

 lengthwise and crosswise. 

 To which group does the 

 onion belong ? 



Tear one of these leaves 

 and observe that the tear 

 follows the direction of the 

 veins. 



Conclusion. How many 

 types of parallel veining are 

 there? How do they differ? 



(*) 



Apparatus. Leaves of 

 apple, oak, or poplar. Any 

 firm-veined woody plant will 

 FIG. 57. Parallel veining. do. 



