VARIATION StUDIKS IN BROME GRASS 
11 
Plate No. 10. 
the stools from tillering by the underground root stalks so abundantly 
as to mix this strain with the adjacent plants in the same rows and 
even with adjacent rows. The color is a very dark green. Altho 
this plant is shorter in height than plant No. 6, the leaf mass has an 
average height of 21 inches as compared with 19 inches in the case 
of plant No. 6. 
Plant No. 6 (Plate No. 5) is also shown as it appeared in the 
spring of 1913. 
* 
Plant No. 40 (Plate No. 6) illustrates another type of variation 
which takes place. In this plant, the leaf mass is only 10 inches high, 
altho the leaves are exceedingly abundant. The seed heads are also 
short, attaining an average height of only 18 inches in 1912. This is 
a type of plant that we have designated as a purely pasture type. 
It does not make growth enough even under good irrigation condi- 
somewhat less than plant No. 6. The leaf type is what we describe 
as very narrow. The leaves, altho short, are exceedingly abundant, 
so that a very felty tuft or sod is produced. The stools are exceed¬ 
ingly abundant and artificial means have to be resorted to to keep 
