DESCRIPTIVE MANUAL 



41 



Fig. 22-A. Distribution of Wild Oats. 



spikelets 2-4-flowered, with empty glumes % to 1 in. long, and 

 pubescent, flowering glumes 6-9 lines long, awns nearly twice as 

 long as the spikelets. 



Distribution. — Common in Canada, rare in eastern North Amer- 

 ica, abundant in the northwest, Wisconsin, Minnesota, Dakotas, 

 Rocky mountains and Pacific coast. In a few counties in northern 

 and northeastern Iowa. 



Extermination. — Largely spread with oats seed. Use only clean 

 oats seed. It succumbs readily to cultivation. Practice rotation of 

 crops. Corn or some other cultivated crop should follow oats. The 

 oats field should be brought into meadow. Clover and timothy are 

 good rotations. 



Crowfoot Grass, Wire Grass {Eleusine indica Gaertn.). 



Description. — A coarse, tufted annual, with erect or spreading 

 stems, 6-24 in. high, and digitate spikes ; sheaths compressed and 

 sparingly ciliate; leaf -blade long and narrow, both surfaces glab- 

 rous, or the upper scabrous and thinly hairy; spikes 5-7, 2-4 in. 

 long, digitate at the apex of the culm, often with 1 or 2 lower down, 

 widely spreading ; spikelets closely imbricated, l 1 /2-2 lines long, 3-6- 

 flowered ; glumes obtuse, the first small and 1-nerved ; seeds rugose, 

 enclosed within a thin, loose pericarp. 



Distribution. — Naturalized from the Old World. In waste 

 ground, streets, yards, from New England to Ibwa, and common 

 southward. In Iowa, in Marshall, Scott, Pottawattamie, and Clin- 

 ton counties. 



