178 



WEED FLORA OF IOWA 



cal ; pinnate leaflets, 7-21 with smaller ones between, oblong, sharply 

 serrate, silky-4;omentose beneath ; flowers with 5 bright yellow petals ; 

 peduncles elongated ; styles filiform. 



Distribution. — Common eastward in brackish marshes; also in 

 the Dakotas and the Kocky mountains ; common in Wright county, 

 Iowa ; perhaps in other places. 



Extermination. — Give a shallow cultivation; expose the roots to 

 the sun. Care must be used to kill the weed on its first appearance 

 as it is quite persistent. 



Wild Rose (,Bosa pratincola Greene). 



Description. — ^Low shrub with very prickly stem; compound 

 leaves of 7-11 leaflets, broadly eUiptieal to oblong-oblanceolate, sub- 

 cuneate at base, short stalked or sessile, serrate; stipule narrow, 



Fig. 101. Wild Rose (Rosa pratincola). Grain fields, roadsides. 

 (Photograplied by Coibum.) 



