224 



TAXONOMIG STUDIES IN THE GENUS CERASTIUM : I 



lack of precision in the first analysis arises from the fact that all three groups have been 

 treated at the same time. If, however, we use this analysis to decide to which two groups, 

 out of the three, these specimens belong, it is possible to use another analysis, based on 

 the two groups only, to determine to which group they should be allocated. Since these 

 latter analyses are based on two groups only, they are correspondingly more sensitive 

 and determination is the more sure. The values of A and of F for these discriminant 

 analyses are shown below : 



Between Groups A and B (C. atrovirens and C. pumilum) 

 Aj = + 4 A3 = + 11 



A3 = 



+ 16 



A2 - - 17 



F Group A. 

 F Group B. 



A4 = + 5 



C. atrovirens = 

 C. pumilum = 



+ 634 

 - 345 



So that specimens with values of F above + 145 should be placed in C. atrovirens and 

 those with values of F below + 145 in C. pumilum. 



Table 4 



Critical values of the ratio sepal/petal 



Class No. 



Ratio 



Class No. 



Ratio 



Class No. 



Ratio 



01 



0-9235 



35 



1-7225 



69 



2-5215 



02 



0-9470 



36 



1-7460 



70 



2-5450 



03 



0-9705 



37 



1-7695 



71 



JUOJ 



04 



0-9940 



38 



1-7930 



72 



2-5920 



05 



1-0175 



39 



1-8165 



73 



2-6155 



06 



1-0410 



40 



1-8400 



74 





07 



1-0645 



41 



1-8635 



75 



Z DDZj 



08 



1-0880 



42 



1-8870 



76 



2-6860 



09 



1-1115 



43 



1-9105 



77 



2-7095 



10 



1-1350 



44 



1-9340 



78 



2-7330 



11 



1-1585 



45 



1-9575 



79 



2-7565 



12 



1-1820 



46 



1-9810 



80 



2-7800 



13 



1-2055 



47 



2-0045 



81 



2-8035 



14 



1-2290 



48 



2-0280 



82 



2-8270 



15 



1-2525 



49 



2-0515 



83 



2-8505 



16 



1-2760 



50 



2-0750 



84 



2-8740 



17 



1-2995 



51 



2-0985 



85 



2-8975 



18 



1-3230 



52 



2-1220 



86 



2-9210 



19 



1-3465 



53 



2-1455 



87 



2-9445 



20 



1-3700 



54 



2-1690 



88 



2-9680 



21 



1-3935 



55 



2-1925 



89 



2-9915 



22 



1-4170 



56 



2-2160 



90 



3-0150 



23 



1-4405 



57 



2-2395 



91 



3-0385 



24 



1-4640 



58 



2-2630 



92 



3-0620 



25 



1-4875 



59 



2-2865 



93 



3-0855 



26 



1-5110 



60 



2-3100 



94 



3-1090 



27 



1-5345 



61 



2-3335 



95 



3-1325 



28 



1-5580 



62 



2-3570 



96 



3-1560 



29 



1-5815 



63 



2-3805 



97 



3-1795 



30 



1-6050 



64 



2-4040 



98 



3-2030 



31 



1-6285 



65 



2-4275 



99 



3-2265 



32 



1-6520 



66 



2-4510 



100 



3-2500 



33 



1-6755 



67 



2-4745 







34 



1-6990 



68 



2-4980 







