DESCRIPTIVE MANUAL 



183 



Fig. 103-A. Distribution of Rattle-box. 



Distribution. — Common from New England to Minnesota, south- 

 west to North Texas. In Iowa abundant only along Missouri river, 

 the Des Moines near Ft. Dodge, and at other points along sandy- 

 beaches of our streams. 



Extermination. — This weed occurs mostly in the Missouri bot- 

 toms, generally on more or less sandy soil. It succumbs readily to 

 cultivation. The raw sandy prairies on which it occurs should be 

 broken up and sown to some leguminous crop, like alfalfa, which 

 will crowd the weed out. 



The Yellow Clover (Trifolium agrarium L.). 



Description. — A smoothish annual, usually upright, with obovate- 

 oblong leaflets, all 3 from the same point (palmate) and nearly ses- 

 sile ; stipules narrow ; corolla yellow, persistent. 



Distribution. — Common in sandy fields and roadsides from east- 

 ern Canada west to Wisconsin and Minnesota and to Iowa ; common 

 along roadsides in northeastern Iowa. 



Extermination. — Same as for low hop-clover. 



