NATIVE GRASSES AND PUCCINIA GRAMINIS 179 



Hordeum pusillum Nutt. Little barley is a very common grass 

 from southern Iowa and central Illinois, southward to the gulf coast 

 and westward. In Missouri it occupies streets and waste places, ex- 

 cluding many vernal plants. It is common in Marshall, Johnson, 

 Scott, Louisa, Wapello, Pottawattamie and Clinton counties, and has 

 been reported from Lyon county in northwestern Iowa by Shimek. 

 It is not, however, except locally, a common grass much north of 

 Clinton county on the east, Marshall in central Iowa and Harrison 

 county in western Iowa. , 



I did not find Piiccinia graminis on this host. Stakman and 

 Piemeisel reported it on this grass at University Farm, St. Paul, 

 Minnesota. 



Hordeum nodosum L., is common in the Rocky mountain region, 

 extending eastward to western Iowa, Minnesota, Texas and Missis- 

 sippi. P. graminis has not been found on it by me. There is no 

 reason why it should not occur because of its close relationship 

 with the squirrel tail. 



Hordeum vulgare L. Generally cultivated in the region, more 

 especially in northern and northeastern Iowa, southern Minnesota 

 and eastern South Dakota and Nebraska. Piiccinia graminis was 

 found at Lake Mills, Spirit Lake, Rock Rapids in Iowa ; La Crosse, 

 Wisconsin ; Graceville, Ortonville and Granite Falls, Minnesota ; 

 Watertown, Brookings and Mitchell, South Dakota, but was not 

 serious at any of these points. 



Hordeum Pammeli Scribner and Ball. This grass was first col- 

 lected by the writer a great many years ago near Dakota City, Hum- 

 boldt county, Iowa. It is not common in Iowa, at least the writer 

 had not observed it in Iowa until this year, probably because it ma- 

 tures early and then disappears. During the past summer frag- 

 ments of the grass were found at Sibley, Iowa, and near Mitchell, 

 South Dakota. It is distributed from central Illinois, Stark county, 

 to Humboldt and Osceola counties in Iowa, Brookings and Mitchell, 

 South Dakota and Wyoming. This is an early maturing perennial 

 grass. It is probably overlooked by most uredinologists for this 

 reason ; then, too, it is a rare grass. The specimens found at Sibley, 

 Iowa, were fragmentary. The plant was growing on the right-of- 

 way of the Chicago, Rock Island & Pacific Railway, next to some 

 plants of Hordeum jiibatum, Agropyron Smithii and A. fenerum. 

 There were some good uredo pustules on the stem. It must there- 

 fore be given as one of the host plants of the rust. I did not make 

 cultures, so the biological form was not determined. Some P. 



