NATIVE GRASSES AND PUCCINIA GRAMINIS 171 



there was an abuiulance of the rust. This rust was observed at 

 Hamihon, W'ahiut and LaSalle. Illinois; Keokuk, Burlington, Mc- 

 Gregor, Postville, Lansing, Dubuque, Waukon, Humboldt, Poca- 

 hontas, Spirit Lake, Sibley, Rock Rapids, Forest City, Thompson 

 and Sioux City, Iowa ; La Crosse, Prairie du Chien, Wisconsin ; 

 Marshall, Graceville and Ortonville, Minnesota; Sioux Falls and 

 \\'atertown, South Dakota. 



Aveneae 



. Avena sativa L., connnonly cultivated throughout the region. 

 Puccinia grauiinis is found everywhere in the region on this host. 

 It was observed in the following localities : Forest City, Thompson, 

 Garner, Concord, Algona, Rock Rapids, Little Rock, Sibley, Spirit 

 Lake, Iowa; Graceville, Ortonville, Marshall, Minnesota; Water- 

 town, Mitchell and Sioux Falls, South Dakota. The abundance of 

 rust in Iowa was closely associated with the common barberry. 



Avena fatiia L., a commonly introduced and naturalized weed of 

 South Dakota and western Minnesota, occasionally eastward as at 

 Albert Lea, Minnesota, Northwood, Iowa, La Crosse, Wisconsin, 

 and Sioux City, Iowa. The P. graniinis is common on the host in 

 Minnesota and Dakota and at Sioux City, Iowa. , 



Holcus lanatiis L. Velvet grass has been cultivated as an experi- 

 mental grass for many years in Iowa and I have seen it occassionally 

 cultivated in Wisconsin, but it shows no tendency to spread in the 

 region. The case is far different in the northwest, Washington and 

 Oregon, where it is one of the common grasses. In Iowa, at least, 

 I did not collect P. graminis on it. I have seen the rust on it in the 

 past, however. 



Arrenatherum clatius (L) Beav. Tall meadow oats grass, like the 

 preceding grass, has been grown in an experimental way for many 

 years in Iowa. It shows little tendency to persist although somew^hat 

 more so than Holcus. On the Pacific coast, especially in California, 

 it is a common grass. I do not recall ever having seen P. graminis 

 on it in Iowa. 



Festuceae 



Dactylis glomerata L. This naturalized European grass is much 

 more common in the southern portion of the area, than northward. 

 It is abundant at Hamilton. Walnut, East Dubuque and Galena. 

 Illinois ; La Crosse, Wisconsin ; Ottumwa, Burlington, Keokuk, 

 Clinton, Dubuque, Manchester. Ames, Council Bluffs and Hamburg, 



