356 



WEED FLORA OF IOWA 



P^G. 207-B. Sneezeweed (.Helenium autum/nale) . 



Fetid Marigold {Dyssodia pUpposa (Vent.) Hitch.). 



Description. — ^A nearly smooth or somewhat pubescent, branched 

 annual with strong odor, 6 in.-2 ft. high; leaves opposite, sessile, 

 pinnately parted, bristly-toothed, with large pellucid glands; 

 heads many-flowered ; disk and ray flowers small, yellow ; involucre 

 with a few scales at the base, one row of scales united to form a 

 cup ; achenes slender, 4-angled, pappus a row of chaffy scales fine- 

 ly divided into numerous rough bristles. 



Distribution. — Common from western Iowa and Minnesota to Il- 

 linois and to the southwest. Common in western Iowa along right 

 of ways, streets, barnyards and fields. 



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

 tion. It sometimes occurs in clover seed and alfalfa seed. 



