18 



More troublesome than the last in corn fields and cultivated 

 fields generally. 



Cenchrus tribuloides, L. Hedgehog or Bur-Grass; but 

 better known as Sandburs. 



On poor sandy soil along rivers, etc. 



Avenafatua, L. Wild Oats. 



In grain fields. Introduced a few years ago and somewhat 

 troublesome. This species is widely diffused, in Australia. 

 South America, etc. Employed for fodder in California and said 

 to be very good.* 



Bromus secalinus, L. Chess or Cheat. 



In grain fields especially noticeable in winter wheat or rye. 

 Sometimes in meadows, but is not invaluable as a forage plant. 



Agropyrum repens, Beau v. Couch Grass or* Quack Grass. 



In grain fields, where it is a nuisance, but as a forage plant it 

 is valuable. 



Hordum jubatum, L. Squirrel-tail Grass. 



It is probably only a waif. It is not a native here. In July. 

 188(5, I found a small patch on the C, M. & St. Paul K. E. near 

 La Crescent, Minn. 



Table showing origin of weeds. 







Orders. 



Eu. 



U.S. 



Eu.&U.S. 



Trop. Am. 



Asia 



Total. 





4 

 4 

 1 



1 



1 



















4 













1 



Malvaceae 









1 



•) 





1 







1 





1 









1 





2 



2 

 1 

 1 

 1 

 9 

 2 



1 



o 







-4 











•> 



Cucurbitaceae 











1 













1 





3 



10 









4 





1 



> 







20 









2 





2 









:\ 



Con vol vulaceae 



1 







1 





1 

 o 



1 

 1 







1 



2 





1 

 1 



1 







3 



Labiatae 









•> 



Plantagineae 









•) 







2 





2 



Chenopodiaceae 



2 

 5 



1 

 1 



6 







2 





1 

 1 

 4 



3 







8 









2 











2 





1 





11 









Totals 



46 



30 



8 



2 -2 



88 











