240 



WEED FLORA OP IOWA 



Fig. 138-A. Distribution of Common Milkweed. 



Extermination. — Both milkweeds have the same habit of growth. 

 The weed is perhaps known by its long roots which are frequently 

 10-15 ft. ia length ; another important point is that it produces ad- 

 ventitious buds at frequent intervals from which new shoots arise. 



Pig. 138-B. Common Milltweed (Asc!epias syrtaca). Grain fields, waste places. 

 (Photographed by Charlotte M. King.) 



