358 



WEED FLORA OF IOWA 



Fig. 209. Fetid Marigold (Dyssodia papposa) . 

 (Drawing by Charlotte M. King.) 



Yarrow (Achillea millefolium L.). 



Description. — A perennial with simple stem l-2y 2 feet high; 

 leaves twice-pinnately parted, the divisions linear ; 3-5-clef t flowers 

 in corymbose heads, fiat-topped ray flowers usually white, 4-5, 

 sometimes pink; plant with a somewhat pungent odor. 



Distribution. — Widely distributed in fields, especially gravelly 

 knolls and drift soils through the state; particularly common in 

 northeastern Iowa, found from the Atlantic to the Pacific, also 

 in Europe and Asia. 



Extermination. — The weed is not difficult to destroy by cultiva- 

 tion. It is not uncommon in clover seed. Practice rotation of 

 crops; when in the pasture where it is apt to be very common cut 



