142 R. H. RICHENS 



blacked in clockwise to show where the value of each characteristic lies relative to the 

 total range. 



NBJkTIVI 

 BREADTH 



O I 2 3 TOOTH NUMBER 4 5 6 7 8 9 



Fig. 3. Graphical representation of the affinities of the samples collected in major square 52. The coordinates 

 indicate relative breadth and tooth number; a range scale of 0-9 is used. The widths of the shaded sectors 

 represent three minor quantitative characters. Circles indicate smooth leaves; triangles, scabrous leaves. 

 The bars connect samples which the t test fails to separate. 



All samples which cannot be separated by the t test in any of the 5 characters are 

 joined by a connecting bar. As a general rule, differences between the absolute means 

 were significant if they exceeded the following values : 



Relative breadth -07 



Number of teeth 10-15 



Relative petiole length -02 



Basal asymmetry -02 



Obversity '03 



Tooth number is not normally distributed and the number of teeth required for a 



