24 
Journat oj Agricultural Research 
Vol. XXIX, No. 1 
Freeman (14), in a durum-common 
wheat cross, found the Fj hybrids taller 
than the tallest parent and a wide 
segregation for height in the F 2 . There 
was greater variability in the shorter 
progenies, indicating a complex char¬ 
acter. 
In the present study, the height of 
the individual F> plants was measured 
at harvest time at the three stations 
where the material was grown. Plate 
2 shows the writer taking height notes 
at Davis, Calif. Height was measured 
from the base of the culms to the tip of 
the spike, not including the awns 
of awned strains. The frequency dis¬ 
tribution by height classes, comparing 
F 2 plants with the parents, is shown 
in Table XVI and graphically in 
Figure 3. Only at Davis, Calif., were 
reciprocal crosses studied for this char¬ 
acter. 
Table XVI.— Segregation of 2,532 F 2 plants of the Kota-Hard Federation or 
reciprocal crosses , in comparison with parents, into 3-inch classes for height of 
plant, when grown at Davis, Calif., St. Paul, Minn., and Mandan, N. Dak., in 
1922 
Source and height 
classes (inches) 
Number and percentage of plants on height of plant 
Fa hybrids 
Hard Federation 
Kota 
Kota X 
Hard 
Federa¬ 
tion 
Hard 
Federa¬ 
tion X 
Kota 
Total 
Percent¬ 
age 
Number 
Percent¬ 
age 
Number 
Percent¬ 
age 
DAVIS, CALIF. 
30_ 
1 
1 
0.1 
33..... 
2 
2 
. 2 
1 
2. 6 
36_ 
1 
3 
4 
.4 
1 
2. 6 
39... . 
4 
3 
7 
.8 
1 
2. 6 
42_ 
4 
7 
11 
1 2 
4 
10. 2 
45..... 
14 
22 
36 
4.0 
17 
43. 6 
48_ 
49 
70 
119 
13.3 
13 
33.3 
3 
7.5 
51__ 
85 
145 
230 
25.6 
2 
5.1 
17 
42.5 
54__ 
100 
197 
297 
33.1 
16 
40.0 
57...... . 
54 
99 
153 
17.0 
4 
10.0 
60_ 
12 
24 
36 
4. 0 
63___ 
1 
1 
2 
0. 2 
Total_ 
324 
574 
898 
99.9 
39 
100.0 
40 
100.0 
ST. PAUL, MINN. 
. 
24_ 
1 
... 
■ 
.2 
1 
3.1 
27.. 
5 
.9 
1 
3.1 
30_ 
8 
1.4 
11 
34.4 
33_ 
22 
3.9 
7 
21.9 
1 
2.8 
36_ . 
101 
17.8 
7 
21. 9 
39_ 
211 
37.3 
5 
15.6 
4 
11. 1 
42__ 
163 
28.8 
14 
38. 8 
45_ 
46 
_ 
8.1 
15 
41. 7 
48_ 
7 
1.2 
1 
2. 8 
51.. 
2 
. 4 
1 
2. 8 
Total_ 
566 
-- 
100.0 
32 
100.0 
36 
100.0 
MANDAN, N. DAK. 
15.. 
. 
1 
1. 5 
18_ 
i 
. 1 
2 
2.9 
21_ 
3 
.3 
3 
4.4 
24_ 
5 
.5 
14 
20.6 
27_ 
24 
2. 2 
27 
39. 7 
2 
2. 4 
30_ 
145 
13.6 
19 
28.0 
2 
2. 4 
33_ 
416 
— 
38.9 
2 
2.9 
8. 5 
36_ : 
351 
32.8 
44 
53. 7 
39.... . 
101 
9. 5 
26 
31. 7 
42_ 
21 
2. 0 
1 
1. 2 
45_ 
1 
. 1 
Total_ 
1,068 
_ 100.0 
68 
100.0 
82 
99.9 
