F. H. WHITEHEAD 



221 



Of the characters discussed above, the following were selected for use in the dis- 

 criminant analysis which appeared to be the most suitable method for use in separating 

 these taxa : 



(1) 



seed size 



X 



(2) 



pollen size 



y 



(3) 



sepal/petal ratio 



z 



(4) 



bract/scarious tip ratio 



u 



(5) 



petal length/petal cleft ratio 



V 



As described in Whitehead (1954) it is first necessary to construct tables of critical 

 values; that is, the total range of variation for each character is divided into 100 parts. 

 These critical values are shown in Tables 1 to 5. 



The results of the discriminant analysis between groups A, B and C, whose working 

 in full is given in Whitehead (1948 thesis), were as follows : 



Ai = - 42 7 A4 = - 90 



= - 20 A3 = + 29 



Table 1 



Critical values of pollen size (diameter in /n) 



Class No. 



Diam. /u, 



Class No. 



Diam. ^ 



Class No. 



Diam. /x 



01 



19-695 



35 



26-325 



69 



32-955 



02 



19-890 



36 



26-520 



70 



33-150 



03 



20-085 



37 



26-715 



71 



33-345 



04 



20-280 



38 



26-910 



72 



33-540 



05 



20-475 



39 



27-105 



73 



33-735 



06 



20-670 



40 



27-300 



74 



33-930 



07 



20-865 



41 



27-495 



75 



34-125 



08 



21-060 



42 



27-690 



76 



34-320 



09 



21-255 





07.0QC 

 / / 00 J 



77 





10 



21-450 



44 



28-080 



78 



34-710 



11 



21-645 



45 



28-275 



79 



34-905 



12 



21-840 



46 



28-470 



80 



35-100 



13 



22-035 



47 



28-665 



81 



35-295 



14 



22-230 



48 



28-860 



82 



35-490 



15 



22-425 



■ 49 



29-055 



83 



35-685 



16 



22-620 



50 



29-250 



84 



35-880 



17 



22-815 



51 



29-445 



85 



36-075 



18 



23-010 



52 



29-640 



86 



36-270 



19 



23-205 



53 



29-835 



87 



36-465 



20 



23-400 



54 



30-030 



88 



36-660 



21 



23-595 



55 



30-225 



89 



36-855 



22 



23-790 



56 



30-420 



90 



37-050 



23 



23-985 



57 



30-615 



91 



37-245 



24 



24-180 



58 



30-810 



92 



37-440 



25 



24-735 



59 



31-005 



93 



37-635 



26 



24-570 



60 



31-200 



94 



37-830 



27 



24-765 



61 



31-395 



95 



38-025 



28 



24-960 



62 



31-590 



96 



38-220 



29 



25-155 



63 



31-785 



97 



38-415 



30 



25-350 



64 



31-980 



98 



38-610 



31 



25-545 



65 



32-175 



99 



38-805 



32 



25-740 



66 



32-370 



100 



39000 



33 



25-935 



67 



32-565 







34 



26-130 



68 



32-760 







