EXPERIMENTS WITH DURUM WHEAT. 13 



Key to the groups and varieties of durum wheat. 



Group. 

 Spike awned, flattened transversely to the plane of the 

 rachis; kernel white (amber), vitreous (hard). 

 Glumes glabrous. 



Glumes white to light brown. 



Awns white to light brown Kubanka. 



Spike oblong to broadly oblong. 

 Beaks 1-2 mm. long. 



Plant tall. (Argentine, Beloturka, Bu- 

 ford, Gharnovka, Kubanka, Pererodka, 

 Taganrog, Yellow Gharnovka.) 

 Plant mid tall; spike narrower. (Monad.) 

 Beaks 1-10 mm. long. (Marouani, Saragolla. 1 ) 

 Spike narrowly oblong, strongly nodding, 

 beaks l-3-o mm. long. (Arnautka.) 



Awns black Pelissier. 



Beaks 1-2 mm. long. (Medeah.) 

 Beaks 1-10 mm. long. (Pelissier.) 

 Glumes thinly to densely pubescent. 



Glumes white. (A'elvet Don.) Velvet Don. 



Glumes brown to black, beak 1-2 mm. long. (Black Don, 



Kahla, Purple.) Kahla. 



VARIETAL EXPERIMENTS. 



This bulletin is believed to contain the results of all the important 

 varietal experiments with durum wheats which have been conducted 

 in the United States. The results of two experiments in Canada are 

 included also. As early as 1892 the North Dakota Agricultural 

 Experiment Station had a durum variety (Wild Goose) in its varietal 

 experiments, and in 1893 it was included by the South Dakota Agri- 

 cultural Experiment Station also. Experiments with durum wheat 

 were begun in 1895 by the Canadian Department of Agriculture. 

 From 1899 to 1903 stations in a number of different States began 

 experiments with a series of durum wheat varieties. 



The seed of the varieties tested by the Canadian stations was 

 obtained by them. The varieties under experiment by the various 

 stations in the United States were mostly those introduced by the 

 United States Department of Agriculture from Russia and elsewhere, 

 and the accession numbers they bear in the tabulated data are those 

 of the Office of Cereal Investigations. 



Geographic Scope. 



Seventeen different States and Provinces are covered by the varietal 

 experiments presented in this bulletin. They extend from Iowa and 

 Wisconsin on the east to California and Oregon on the west, and from 

 Texas on the south to Manitoba and Saskatchewan on the north. All 



1 A black-awned strain also is grown. 



