Growth of Roots, Stems, and Leaves 



Ex. 4. Place Zea mays seedlings where they are warm. When 

 the first blade is about 2 inches above ground, or as soon as the leaf 

 which it is protecting has burst through, separate carefully with a fine 



FIG. 26. Showing basal growth in Zea mays. 



needle, and strip from the sheath to expose the base of the leaf within. 

 Mark off lines on the part exposed, carrying them across on to the sheath. 

 When growth has taken place, 

 so that the marks appear 

 above the sheath, it will be 

 seen that the place marked 

 has been pushed up by the 

 growth at the base of the 

 leaf. 



Cammelina T will be a 

 good plant for studying the 

 growth of a monocotyiedon- 

 ousstem. Split the sheathing 

 base of the leaf and mark the 

 stem off. Mark other plants 

 Flagellaria, or any of the 

 species of Asparagus (Wacht- 

 een-beetje}. Mark the stem 

 in Spring, when they are 

 growing rapidly. 



Direction of 

 Growth of Roots 

 and Stems. We have 



FIG. 27. Growth of the stem of Commelina. 



1 Commelina is often cultivated ; it is found wild in the Eastern, Central, 

 and Kalahari Districts. 



2 * 



