AMERICAN JOURNAL OF BOTANY 



since the sole superficial difference between the two types of seedlings is 

 found at the primordial node. The frequency distributions in table 5 

 show that the nodal number of bundles is in general lower in the hemitrimer- 

 ous than in the trimerous seedlings. It also indicates that they are higher 

 in the hemitrimerous than in the dimerous seedlings. The averages and 

 their probable errors in the second section of table 4 show that in each of 



TABLE 4. Mean number of bundles in central regions of internodes 



TABLE 5. Distribution of number of bundles in central region of epicotyl 



