18 
same plant gives practically the same results as self-pollination. 
BULLETIN 75, U. S. DEPARTMENT OF AGRICULTURE. 
As 
the same 12 female parent plants were used in all the experiments, 
the factor of individual variation is eliminated. 
At Chico, Cal., in 1909, flowers on different branches of two se- 
lected alfalfa plants were pollinated, (a) from the same flower, (0) 
from a different flower on the same plant, (c) from a separate plant 
of the same variety, and (d) from a different variety. The female 
parent in one case was a plant of Peruvian alfalfa, S. P. I. No. 3399; 
in another, ordinary alfalfa, F. C. I. No. 5099; and in the third, 
Turkestan alfalfa, S. P. I. No. 18751. 
The results at Chico and also 
of similar experiments conducted at Arlington farm in 1908 and 
1909 are given in Table IX. 
TABLE IX.—Resuits of the pollination of alfaifa flowers from different parents. 
CHICO, CAL., 1909. 

Female parent. 
Male parent. 


OOO E car ey Bape, Spas eae 
ra E oA rites a i Renae aE | 
Same mower ae. oe ee 
Another flower on same 
plant. 
Another plant of same va- 
riety. 
12694 (Provences-.....-.52.. 
18823, ATA DIOg Ase eee eee: 
O91 ankes tance mee ee 
1 S827 tale net 
Another flower on same 
plant. 
Another plant of same va- 
riety. 
12694. PLOVeRCRLe: 2-22 ' 


ers. 
| 26 

| 44 
198 22EMUrKey she Sone eee | 

Number | 
| of flow- 
| Number 

ARLINGTON F4RM, VIRGINIA. 

Same flower......... SecGen 
F.C. 1, 28, M. sativa(Kan.). 
Re Cels4aGniniin= eee e 
F.C. I. 2072, M. falcata. . 
S. P. I. 20571, sand lucerne. 
Hi Ce 1525 Kansas varie- 
ated. 
g 
S. P. I. 19534, M. falcata. -| 
Same Hower sete eee ee 

| 
| Flowers | 

| ing 
| of pods. | beamnes 
pods. 
| 
| 
es | oe ees ea 
| | 
i 


Number of seeds. 
| Average 
Total. | per pod. 
i ee ae es 
wee eee ee ee ee ce ee eee 
ees ea) 
ee ee ee? 
ee ee 

SURO Oty SuCe i bt 
CSCO BNOWwWA 

The results indicate that cross-pollination is usually much more 
efficient than self-pollination, whether the latter is by the same flower 
or by another flower of the same plant. 
The efficiency of cross- 
pollination is about thé same, regardless of whether the pollen- 
producing parent is the same or a different variety. 
