DESCRIPTIVE MANUAL 



219 



Fig. 127-A, Distribution of Slda. 



Cheeses or Common Mallow {Malvarotundifolia L.). 



Description. — A procumben't biennial ; leaves round; heart-shaped 

 on long petioles, crenate ; flbwers white, petals longer than the calyx ; 

 a 3-leaved involucre at the base of the calyx ; carpels pubescent. 



Distribution. — A widely distributed weed in eastern North Amer- 

 ica, native to Europe, common in eastern and central Iowa in door- 

 yards, barn lots, etc., in Stoi-y, Mairshall, Polk, Marion, Linn, Clin- 

 ton, Winneshiek and AUamakee counties. 



Extermination. — This weed is easily exterminated by cultivation. 

 Do not permit any of the seeds to mature. The seeds retain their 

 vitality for a considerable length of time. 



