392 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
number are put in one group. The highest numbers for the 106 
plants of TABLE 21 range from 30 to 20 and the lowest numbers 
from 16 to 10; for the plants of TABLE 22 the highest numbers 
range from 33 to 17 and the lowest from 17 to 9. For the plants 
as a whole there is therefore a greater range for the highest number 
per head than for the lowest number. 
TABLE 22 
RANGE OF VARIABILITY OF FLOWER NUMBER PER HEAD ОЕ 189 ONE- YEAR-OLD 
PLANTS OF THE F3 GENERATION 
| | 
Марат df | ашын ағы | Minimum flower number Difference between 
plants number | maximum and 
| Range Average average minimum 
I 33 cae emg 13.0 20.0 
І 27 13.0 14.0 
5 26 15-13 14.4 11.6 
3 25 15-14 14.7 10.3 
9 24 15—13 13.8 IO.2 
25 23 16-то 13.6 9.4 
41 22 17-10 13.9 8.1 
4 2I ЗЕЕ IS 7-5 
36 20 I5— 9 12.9 T.I 
II | 19 ІЗ-ІІ 12.0 7.0 
8 | 18 I4-IO го 6.1 
+ | 17 II.0 6.0 
The plants with highest numbers, however, show the greatest 
range of variability as their lowest numbers are as low as the 
majority of the plants with lowest values of the highest number. 
A glance at the TABLES 21 and 22 shows this point. Of three- 
year-old plants those with such high numbers as 30-26 have 
lowest numbers of 17-12, while those with high values at 22-20 
range from 17-11. Of the one-year-old plants the ones with high 
values of 33-23 have low values of 16-10, while those of 22-17 
have lowest values, ranging from 17 to 9. Тһе extremes and the 
averages of the lowest numbers are quite the same irrespective of 
the higher values. 
Different plants exhibit greater variation in respect to the 
highest number of flowers borne in any head than in regard to the 
lowest, and therefore an individual plant exhibits the greatest 
range if the highest number is high for that plant. The variabili- 
ties of individuals and of groups increase as the upper limits of 
flower number increase. 
