Minnesota Plant Life. 



421 



Beautiful examples of elastic plant organs are furnished by any 

 field of grain over which a gust of wind is passing. The stems 

 with their heavv heads of fruit, under the breeze bend almost to 



FIG. 212. Willows and bulrushes. The latter are typical surf-plants. After 

 photograph by Williams. 



the ground, then as the air becomes calmer elastically swing back 

 again into the erect position. Or, when it is blowing a great 



