CLASSIFICATION OF AMERICAN WHEAT VARIETIES. 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 under 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 sowings which were made. 
TABLE 1.—Annual and total number of rows sown 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 Be 
by [o) 
Si) . 
Station. bb bi eh bh eb bb a 
aor |p asl fy § ots Bs nS As KS A = As aa 5, 
S 5 3 5 a 5 3 5 3S 5 eS 5 a A 
Bi) co ey lea te Vea ly ee Veco hey | aco | ee \ eet tee 
Chico Cahiinsgrey 2 146): 0.22. 790)..---- 902-2 e 2 950)... .-: 720} 720) 1,419)...... 5, 647 
WOEVGISNO rege artery |e cual ert panes | er eG Se elec a at 944) 1,091} 495) 495) 480) 480] 3,985 
Moro Oreos seis 152} 691) 313) 1,804) 554) 950) 1,091) 495)...... 235) 480] 6, 765 
(HDD WoaeAya NSN aN A ge ee PE PAVE ES et ea 1862s 126) 109) 421 
Aberdeen, Idaho..-....|.... EG Elica Oellarae eal | hese [te ever ele sees | cere eam te es ara ae al leteer rete ae 784 
Nepiaicau ta lie: ay sie eles | i e'alars ABO leis aa e ee pti eae Gree | Saeeton. Wel Pete Fafa ts uli seen 430 
ES OZ CTIA MOTG vrs [ets Leora cto aieinictel a lleiere oie laser oes scale neal oer Meee a Re Saisie 126 eee 126 
Moccasin, Mont..... 680) Se5 2. - OES peers takes yet i er cr Ka Sl NE ad ee De 1, 299 
Mikron Colones Gi ee EAA E TNA: SOD Hate | Wes os ROSA Ne Pe A, oles Wea ae ay ae 302 
Hort Collins holo seal ee cae ce Tee a eh cen al eh mec a eT oe ai 126) 2582 126 
Williston, Ty TY cas eae er eA ESA eset eel cet UR eas ail AUR calla ghia a 554 
Dickinson, N. Dak....|.... CRSA bcs ee a seat aa ee ee rd aera Rea a eS 787 
INewellAS oD ake oe ei epetied tenes | eeu UG [Pa ec Rec eee eI eee CE cal Rae ee |i | ea ate Rs ae 619 
St.Paul, Minn 202305.) . CES eat UR ENS aa EN Ba A Sera oe ON Fe 657 
Manhartanskanseee sen ee ke ae BB MN AE Sa eA Te cee ea ge Ha A | Fr 534 
Amarilon Rex 22530 ea BY Ue A cis ie Badal WG Sais aS Serie eerie IAG Ctl BIGE Tet BE Esl Enea coed Ine 550 
ArhinetonsMarmy Via elie sees ass cies sella e- (ee 5e255 ts) eens Cai dears CA ape 230| Scns. 1, 494 
Gb aca yee sk yc as|2 ePaae Oe A ete SAO Ye SUN AR ee | et ata a Wan Fae DEI OR ee 301 
Potabeie. wie. 146] 2,990 3, 054) 1, 864| 3, 743] 1, 108| 3,367] 2,182] 1,896] 1,215) 2, 747] 1, Lae 381 
Table 1 shows that during the six years 1915 to 1920 more than 
25,000 separate sowings were 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 
