258 A TEXT-BOOK OF BOTANY 
a small root system in light or sandy soil. When the work 
of the season is over, and the absorbing rootlets have 
shriveled, the plant is | 
easily broken from its \ 
Fic. 255.—Seed of willow herb with tuft 
of hair. 
Fic. 256.—A common tumbleweed, 
