18 
BULLETIN 1195, U. S. DEPARTMENT OF AGRICULTURE. 
viable pollen is used. The tendency to parthenocarpy, however, has 
not thus far been observed in any plant having considerable viable 
Eollen. To determine the size which fruits of this type attain, 100 seed 
alls were collected in 1922 from between the rows of varieties belong- 
ing to the Rural group. At this time (August 22) practically all of 
the seed balls on these varieties had dropped off. The diameters 
ranged from 7 to 16 millimeters, averaging 11.66 millimeters. None 
of these fruits contained seeds. 
Table 3. — List of potato varieties studied, showing the class to which each is assigned 
with respect to the condition of its anthers and pollen and to its ability to produce seed 
balls. 
[A roman numeral in parentheses alter the varietal name indicates the group to which the variety thus 
marked has been referred according to the classification of Stuart (23) and of the Committee on Varietal 
Nomenclature and Testing, Potato Association of America (25). An asterisk (*) indicates that the pollen 
of the variety thus marked was tested for two seasons. A single plus sign ( + ,i indicates that the variety 
is a little better with resDect to condition of anthers and pollen or with respect to ability t j produce seed 
balls than the standard for the class in which it has been placed. The double plus signs (4- + ) indicate 
an abundance of viable pollen, or prolific production of seed balls. The minus sign (— ) indicates that the 
variety is below standard, but not low enough to place in the next lower class. The use of the question 
mark (?) denotes an uncertain status. While work thus far has not shown any evidence that the variety 
can produce seed balls, it is possible that further efforts may prove successful. The method of pollina- 
tion on which the conclusions in columns A to D are based is indicated by circled figures as follows: ©= 
Controlled pollination by hand, ®=natural fertilization in the field, ®=both controlled and natural 
pollination.] 
Source. 
Class with respect to— 
Variety or species. 
Condition of 
anthers and 
pollen. 
Ability to pro- 
duce seed balls. 
1 2 
3 4 
A 
B C 
D 
North American, European, and miscel- 
laneous varieties: 
Ally.. 
3 
3 
...do 
A® 
A® 
A® 
American Giant (VIII) 
United States 
3 .... 
3 L- 
:::::::: 
Axtell's Early (I) 
United States 
3 
3 
3 
Beats-Them-All (VI) 
do 
...do 
Beautv of Hebron (VI) 
T- 
A® 
........ 
Bishop 
. .do 
3 
— — 
Poland 
1 
Bountiful ( Vin) 
?, 
Great Britain 
3 
B® 
Brown Beauty (IV) 
4 
4 
Burbank (VII) 
United States 
D 
Poland 
*1 
A® 
California Russet (VII) 
4 
D 
Carman No. 1 (VIII) 
do 
...do 
*3 
3 
Carman No. 3 (IX) 
A® 
A® 
A® 
Germany (?) 
2 
United States 
4 
B® 
Clio 
*1- 
Condon's Early Snowflake (I) 
Country Gentleman (VIII) 
United States 
3 
3 
...do 
I 
A® 
Cumrnings' Pride (XII) 
4 
B® 
Delaware (VIII) 
United States 
3 
3 
Deposit Wonder 
Earliest-of-All ! (LU) 
do 
do 
....do 
"4" 
4 
4 
A® 
Early Eureka (I) 
Early Harvest (III) 
....do 
Early Ohio (V) 
do 
do 
*3 
3 
*3 
A® 
Eirly Rose (IV) 
Early Standard (Dreer's) (I) 
do 
..do.... 
"2 
.... 
A® 
Early Sunrise (IV) 
do 
....do 
3 
4+ 
4+ 
4 
4 
4 
Great Britain 
.do 
Ehnola (III) . 
Eldorado 
Great Britain 
» This varietv represents the type of Earliest-of-All which is grown in the State of Washington and is 
distinct from the Irish Cobbler stock, to which this name is sometimes applied. 
