IMPORTANT RAX<;K 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. 



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