IMPORTANT RANGE PLANTS. 63 
ment determinations of species were made from two to four weeks 
after the flower stalks began to show. 
Since the character of the soil and the nature of the habitat play 
an important role in the amount of water the substratum may yield 
to the plant, the wilting of species was tested as nearly simultaneously 
and under as nearly the same topographic features as possible. The 
results therefore are comparable. 
To ascertain the germination per cent of the seed crop, matured 
seeds were collected in the fall of each year for three years from 
typical situations, and germination tests were made in the seed- 
testing laboratory of the United States Department of Agriculture. 
o 
