NATURAL WHEAT-RYE HYBRID NO 18 
Four hybrid heads are shown in the center with two heads of the pare 
When the wheat variety has rather small | 
Reduced to approximately two-thirds natural size. 
side. 
Compare this with hybrid No. 19. 
(Fig. 21.) 
are usually en- 
tirely sterile. already stated, only 
one kernel was produced by all the 
natural hybrids found at Arlington pre- 
vious to 1918. Of the nineteen plants 
found in that year seven produced one 
or more. kernels. .Four of them pro- 
duced only one, the other three pro- 
duced five, nine, and twenty-two res- 
pectively. Of the forty kernels 
Wheat-rye hybrids 
wheat on the o 
the hybrid | are rather 
were classed as 
seventeen as fairly well 
developed, and seventeen as _ poorly 
developed, shriveled or misshapen. 
Probably most of them will grow, for 
out of thirteen planted in the green- 
house twelve have produced plants now 
vigorously growing. 
All these kernels are the results of 
open pollinations. No attempt was made 
produced, six 
developed, 
133 
