366 



WEED FLORA OF IOWA 



Western Mugwort {Artemisia ludoviciana Nutt.). 



Description. — ^A branching perennial with inconspicuous flow- 

 ers; leaves and stems white, woolly; leaves lanceolate, the upper 

 usually entire, the lower cut- toothed ; heads in narrow panicles, ray 

 flowers absent; involucre of dry scarious scales; receptacle naked; 

 flowers small, yellowish; achenes obovoid; no pappus; trichomas 

 long, simple, cylindrical, tortuous. 



Distribution. — This weed is common from Illinois north to Sas- 

 katchewan, southwest to Texas, and west to Utah. It is quite 

 widely distributed in the state of Iowa. 



Extermination. — This weed is easily exterminated by cultivation. 

 After the crop has been removed the field should be plowed thus 

 leaving the soil in good condition. 



Fio. 214. Western Mugwort, or White Wormwood (Artemisia ludoviciana). 



Common In gravelly places, fields and pastures, a, plant hairs. 



(Photographed by Colburn. u. Drawn by Charlotte M. King.) 



