CLASSIFICATIOX OF AMERICAN WHEAT YAKIETIES. 
11 
commercial varieties have been given the most careful study. Many 
varieties not previously known were obtained and grown. Each 
year the varieties studied during the preceding season, with all new 
material obtained, were grown in the classified order presented herein. 
Each year, therefore, the classification became more definite and 
complete. There still remains much to be learned about the Ameri- 
can varieties, but it is thought that publication of the information 
compiled to date should no longer be delayed. 
CLASSIFICATION NURSERIES. 
Classification nurseries have been grown in several widely sepa- 
rated sections of the United States. This was necessary in order 
to determine the expression of varieties imder different environments 
and thus embrace a scheme of classification which would be workable 
wherever the varieties happened to be grown. It also guarded 
against the loss of certain types, which often results if wheat is 
grown at only one place. In Table 1 is shown the location of 18 
experiment stations where classification nurseries have been sown, 
as well as the annual and total number of sowinofs which were made. 
Table 1. — Annual and total numlier of rows sonn in the classification nurseries 
of fall and spring wheat at one or more of 18 experiment stations in the 
United States during the 6-year period from 1915 to 1920. inclusive. 
1915 
1916 
1917 
1918 
1919 
1920 
station. 
Is 
13 
C 
^ 
fe 
a, 
^ 
f^ 
tii 
1 
;2 
.s 
|it 
Chico, Calif 
146 
790 
W 
950 
9^ 
950 
"i,"69i 
1,091 
720 
495 
495 
186 
720 
495 
1.419 
480 
235 
126 
5 647 
Corvallis, Oreg 
480 
480 
109 
3,985 
6,765 
421 
Moro, Oreg.. 
152 
691 
313 
1,804 
554 
Pullinan, Wash 
Aberdeen, Idaho 
164 
307 
430 
313 
784 
Nephi, Utah 
1 
430 
Bozeman, Mont 
J 
126 
126 
68^ 
-m 
619 
1 
1,299 
302 
Akron, Colo 
Fort Coll in q Coin 
1-26 


126 
WiTliston, N. T)aV 
.... 
554 
554 
"OirknnsorijN DaV 
787 
1 1 
787 
Newell, S. Dak 

619 


1 1 
619 
St. Paul, Minn 
657 


; 
657 
Manhattan, Kans 
534 

534 
Amarilln, Tex. . 
550 
550 

736 
301 
523 
2:^5 
1,494 
301 
Ithaca, N.Y .. 
1 
Total 
146 
2,990 
3,054 
1,864 
3,743 
1,108 
3,367 
2,182 
1,896 
1,215; 
2,747 
1,069 25.381 
Table 1 shows that during the six years 1915 to 1920 more than 
25,000 separate sowings Avere made. Most of these were made at 
experiment stations in the western United States. The greatest num- 
ber of sowings at any one station, totaling 6,765, was made at the 
Sherman County branch station at Moro, Oreg. ; the second greatest, 
5.647. at the Plant-Introduction Garden. Chico, Calif. ; and the third 
