Stout & Boas: STATISTICAL STUDIES IN CICHORIUM 427 
V. CHARACTERISTICS OF FLOWER NUMBER IN A HYBRID GEN- 
ERATION OF A CROSS BETWEEN PLANTS OF RED-LEAVED 
TREVISO AND A WILD PLANT (A) 
The. plants of this hybrid generation were all of vigorous vege- 
tative growth. They were scarcely as tall as typical plants of 
the red-leaved Treviso, but they were more abundantly branched 
from the base of the main stem. The total number of flower heads 
averaged about the same as for the red-leaved Treviso. 
Data were collected from 50 plants of this generation. For 
these the range of observed numbers per head extended from 
28to то (TABLE 45). This range is less both for highest and 
lowest number than in the red-leaved Treviso. The plant 
with highest number, 28, also gave numbers as low аз II, 
thus exhibiting in its partial variability almost the entire range 
observed. For highest numbers alone the individual variability 
ranged from 28 to 19; for lowest numbers it ranged from 15 to 10. 
Greater differences exist in the highest numbers than in the lowest, 
quite as has been noted for other cultures of chicory. 
TABLE 45 
RANGE OF FLOWER NUMBER PER HEAD OF PLANTS OF THE Е: GENERATION OF THE 
CROSS BETWEEN RED-LEAVED TREVISO AND A WILD PLANT (A) 
Minimum flower number Difference between 
Number of Maximum flower | 2 ~ maximum and 
plants number Range Average average minimum 
I 28 Ши тт.0 17.0 
2 25 15-10 12.5 12.5 
2 24 15-12 13.5 10.5 
7 23 14-12 12.7 10.3 
то 22 15—11 12.7 9-3 
12 21 14-1I 12-8 Et 
I5 20 14-10 15-3 "d 
I I9 : г ыы жадылы 22 
The values a and b have been computed for 12 plants of this 
hybrid generation and these are given in TABLE 46. These are 
sister plants having for seed parent a plant of red-leaved Treviso 
(R ser 1. no. 6) whose performance gave a value of 21.5 for a and 
—0.091 for b. These values are quite the average for the plants 
of this race grown in 1916 (see TABLE 42). 
As shown in TABLE 46, the values of a for these 12 plants ranged 
from 16.6 to 21.4, with the average at I9.I. АП 12 plants gave 
minus values for 5. 
