MIGRATION OF WEEDS 



77 



migration of weeds is 1 an interesting one. In the East the 

 European weeds predominate. In the Southwest and the 

 prairie states west of the Missouri many of the trouble- 

 some weeds are indigenous to the soil. I can recall but 

 a few troublesome weeds in Texas that have come from 

 Europe. The Texas weeds are either of tropical origin 

 or else indigenous. However, there are some troublesome 

 European weeds in Texas, but they do not cover the 





* Brasjico arvensis. , 



olpomoeo heJeTaceo/ftorninq-qlort. 



X >- / ** * i^ t~ * r 



ICenloc/reo SolsTilia/is KnahvoeJ 



Burctovtc 



Fig. 330. Distribution of some weeds. Mustard (Brassica), morn- 

 ing glory, etc. (C. M. King.) 



landscape as they do in the North and East. The narrow 

 leaf sneezeweed is a dominant weed everywhere through- 

 out the state ; and the buffalo bur, which is indigenous 

 to the plains from western Texas to Colorado, is one of 

 the dominant weeds. These weeds have largely spread 

 since the rebellion, 1865. In the West, particularly Utah 

 and the mountainous countries, the scarious leaf thistle 

 is at once a dominant species, although in places it vies 

 with the bull thistle and in all clearings of Oregon and 

 Washington the fireweed (Epilobium angustifolium), cov- 

 ers thousands of acres, while with it we may find patches 



