176 



IOWA ACADEMY OF SCIENCE 



Vol. XXVI, 191^ 



Agropyron Richardsonii Schrad. is not uncommon in native 

 prairie sod of northern Iowa, southern Minnesota and eastern 

 South Dakota. In Iowa it was observed in Winnebago, Dickinson, 

 Kossuth, Lyon and Osceola counties, and in Minnesota at Graceville, 

 Ortonville, Luverne, Worthington and Tracy; in South Dakota at 

 Watertown, Sioux Falls, Mitchell and Brookings. There is no ten- 

 dency for this grass to spread. The grass is not common and not 

 much of a factor in rust. At Mitchell, South Dakota, and Sanborn, 

 Minnesota, it was infected with P. graminis; also at Sibley, Iowa, and 

 a few other points. 



Agropyron rcpens Beauv. Quack grass is generally established in 

 northern Iowa, Illinois, western and southern Wisconsin, Minnesota, 

 eastern South Dakota and western Minnesota. The grass occurs in 

 the greatest abundance in the area north of the main line of the 



Fig. 44. — Barberry and rust, Saint Mary's Orphans' Home, Dubuque. (C. M. 

 King.) 



Chicago & North Western Railway and is most abundant in the 

 center of the Wisconsin drift area, a region embracing the following 

 counties : Emmet, Kossuth, Winnebago, Hancock, Cerro Gordo, 

 Franklin, Wright, Humboldt, Hamilton, Story and Marshall counties, 

 with the center of distribution in Kossuth, Winnebago and Hancock 



