116 



WEED FLORA OF IOWA 



FiQ. 65. lawa Tumbleweed or Tumbling Pigweed (.AmaramXlvaa ffroecteon*). 

 Common in com fields. Plant grows in circular form, separates from th» 

 root in the autumn and rolls over and over, scattering the seeds. 

 (Photographed by Hart.) 



Fia. 66-A. Distribution of Tumbleweed. 



