WHEAT 25 



part of the leaf surrounds the culm. This part is called the 

 sheath, and the loose part of the leaf is the leaf blade. The 

 faint ring from which the leaves start is the node. Count 

 the nodes. The space between the nodes is the internode. 

 Note the length of the internodes. Split the culm and exam- 

 ine the inside. 



