NATIVE GRASSES AND PUCCINIA GRAMINIS 173 



growing in shade, and in moist places llie weather and soil conditions 

 for rust had apparently been favorable, yet the plants were free from 

 rust. 



K(rhvia cristata I'ers. The Koeleria is one of the most widely 

 distributed of the native grasses in Missouri, Illinois, Iowa, Wiscon- 

 sin, Minnesota and the Dakotas. It is common on gravelly knolls or 

 in rocky situations from southern Iowa, Keokuk to Hamburg, north 

 to Lyon county in the west and Allamakee county in the east. It is 

 common everywhere in western Wisconsin along Mississippi river, 

 north to Cass Lake in Minnesota, west to the Red river valley. Big 

 Stone lake and Watertovvn, LaBolt, Brookings, Mitchell and Sioux 

 Falls, South Dakota. In all of this region the P. graminis has never 

 been observed by me. I examined many hundreds of plants during 

 the past summer without finding a trace of the rust on this host. It 

 must be a rare host in nature. 



Bromiis sccalinus L. Cheat is closely associated with the culti- 

 vated small grain crops, especially wheat. At one time it was widely 

 distributed in northern Iowa, and especially in northwestern Iowa. 

 Since wheat culture was discontinued to a great extent, this grass 

 has disappeared. For many years chess did not occur in central 

 Iowa. Since winter wheat culture began in southern Iowa it has be- 

 come common in places as at Burlington, Keokuk, Indianola, Ham- 

 burg, Council Bluffs and Whiting. It is common along Missouri 

 river from Kansas City to Sioux City, and in western Wisconsin and 

 eastern Minnesota. P. graminis was found once this season near 

 Burlington, Iowa. 



Bromiis hordeaceus L. Soft chess is quite generally naturalized 

 in Iowa, Missouri, Illinois and Minnesota, occurring in waste places. 

 I have seen this grass for many years, but I have never seen any of 

 the P. graminis on it. It is probable that in Missouri, Kansas and the 

 west or in experimental plots the rust may occur. I did not see any 

 of the rust this past season on that host in Iowa. 



Bromns tectormn L. The awned brome grass was only a waif in 

 central Iowa in 1892. Now, however, it has become one of the 

 most common of the early spring grasses in central Iowa, at Ames. 

 It has been reported from Mount Pleasant and other parts of south- 

 eastern Iowa. I also observed the weed at Sioux Falls, and Mitchell, 

 South Dakota. It has for many years been a troublesome weed in 

 Colorado, Utah and on the Pacific coast. The P. graminis has not 

 been observed upon the grass in Iowa by me. With us the species is 

 a winter annual. It is possible that in the south and west regions, 

 Kansas, Oklahoma, Utah and the Pacific coast the rust occurs, and 



