434 SEMI-CENTENNIAL OF TORREY BOTANICAL CLUB 
were six plants, having some heads of 24 or more flowers (see 
TABLE 51). One plant (no. 12) produced a head of 33 flowers, 
other plants had heads of 27, 26, and 25 flowers. For the Е, crop 
of 31 plants data were collected from 10 plants that were least 
affected by the tip-rot. These, likewise, showed a tendency to 
produce a few heads with unusually high numbers per head: seven 
of the ten plants had some heads with 24 or more flowers each. 
For no plant was the highest number less than 21. The minimum 
number in any head for these plants, however, was quite as low 
as that ordinarily observed. In this race irregular and sporadic 
variations in partial intra-annual variability occurred, giving a 
few heads with high numbers. The lowest values realized in a 
plant during a season were, however, quite or almost as low as 
were seen in series having no such high numbers. 
TABLE 51 
RANGE OF VARIABILITY OF FLOWER NUMBER PER HEAD OF ONE-YEAR-OLD PLANTS 
OF THE Ез AND Е: GENERATIONS OF RACE I 
мо Minimum flower number рск un 
Number of plants | flower number b Капьё Average | average minimum 
Въ «А х Epa | | 
I 33 koc 12.0 22.0 
I a7 — 13.0 14.0 
І 26 -- 12.0 14.0 
І 25 ax * I5.0 10.0 
2 24 13-тт 12.0 12.0 
3 23 15-то II.7 ir3 
2 22 s 14.0 8.0 
I 21 = 13.0 8.0 
Е. (А X Em)-4-3-11- 
2 26 -- 12.0 14.0 
2 25 І5-ІІ 13.3 т] 
3 24 16-13 14.3 9.7 
2 23 | 15-rI 13.0 10.0 
I 22 | 12.0 10.0 
The general tendency in this race, however, is toward high num- 
bers per head. The values for [o] and for a computed from all the 
data are consistently high. In respect to seasonal change, all plants 
of this race exhibited a marked decrease, as may be seen in the 
values of b given in TABLE 50. The performance with respect to 
terminals and laterals was quite as is most typical of the species. 
The record of pedigree for the two series (Ез and Е,) of this 
