STUDIES ON ULMUS: I 



141 



Table 1. 



Mean values for (1) relative breadth, (2) tooth number, (3) relative petiole length, (4) basal asymmetry, and 

 (5) obversity, of elm leaf samples collected from major square 52. A range scale of 0-9 is used for each character. 

 The marginal figures are the grid reference coordinates of the minor squares. 



9 























8 



72443* 



15536t 



18535t 

 82552* 





26634t 



33644t 









44853t 



7 



57121* 



44433t 

 338071 



163261 







53555t 







45963t 



4 4973 t 



6 



41334t 



27726* 



44568t 





33666t 



63754t 





35616t 



27331* 

 64665t 



44525t 



5 





4955 It 



06434* 



27535* 



36323t 



455451 







344341 

 59232* 



65565t 



4 



56422* 



73555* 



63453t 

 71434* 



44747t 



35651t 



36431t 



46431* 



36432t 







3 







14623t 

 83557* 



81544* 







33423t 



44533* 





44444* 

 54443* 



2 





22323t 





43929t 



25646t 



43704t 



13617t 



44641t 



25557t 



52834t 



1 



63534* 

 34524t 



63436* 











34715t 

 48346t 





35922t 



72620t 



0 





82325* 



72436* 



93344* 



25325t 



10514t 



23522t 



53631t 



33545t 



62915t 





0 



1 



2 



3 



4 



5 



6 



7 



8 



9 



breadth, (2) number of teeth, (3) relative petiole length, (4) basal asymmetry, and (5) 

 obversity. The absolute range for each of these characters is as follows : 



Relative breadth -40- -90 



Number of teeth 50-150 



Relative petiole length -00- -20 



Basal asymmetry -00- -20 



Obversity -40- -60 



Thus, sample 08 in the top left-hand corner of Table 1, expressed as 72443*, relates 

 to the following set of mean absolute values; relative breadth, -79, tooth number, 74; 

 petiole length, -08; asymmetry, -09; and obversity, -47. 



In Fig. 3, the results are presented graphically. The two most discriminant charac- 

 teristics, relative breadth and number of teeth, are used as coordinates, suitably deformed 

 for convenience of illustration, and the three other characteristics are represented as 

 sectors in the circles or triangles pertaining to each sample. Circles are used for smooth- 

 leaved samples, triangles for scabrous material. Sector 8-12 o'clock represents relative 

 petiole length, sector 12-4 basal asymmetry, and sector 4-8, obversity. Each sector is 



