DESCRIPTIVE MANUAL 



219 



Fig. 127-A. Distribution of Sida. 



Cheeses or Common Mallow (Malva rotundifolia L.). 



Description. — A procumbent biennial ; leaves round, heart-shaped 

 on long petioles, crenate ; flowers 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 Story, Marshall, Polk, Marion, Linn, Clin- 

 ton, Winneshiek and Allamakee counties. 



Extermination. — This weed is easily exterminated by cultivation. 

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

 vitalitv for a considerable length of time. 



