WEED MIGRATION 



733 



(Eleusine indica), Europe, Asia, Africa, Australia, New Zealand, 

 North and South America; cheat (Bromus secalinns), Europe, 

 Asia, North America, a weed; brome grass (Bromus tectorum), 

 Europe, Asia, Africa, North America; soft chess {Bromus arven- 

 sis), Europe, Asia, Africa, North America. It is singular that 

 only one species of Bromus is given by Moore and Ferdinand von 

 Mueller, the Bromus arenarius. Reed (Phragmites communis), 

 though not regarded as a weed in the United States, is a cosmo- 

 politan plant found in Europe, Asia, Africa, Australia, New 

 Zealand, Papua, North America (Canada, United States and 

 Mexico). 



Fig. 554. Tumbling Mustard {Sisymbrium altissimum). Introduced with grain 



in the Dakotas. 

 (Dewey, U. S. Dept. Agr.) 



Cress (Barbarea vulgaris) occurs in Europe, Asia, Australia, 

 New Zealand and North America. None of the most common 

 North American weeds among the remaining members of the mus- 



