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WEED FLORA OF IOWA 



cats '-ear (Hypocliaeris radicata) is one of the most common weeds 

 in lawns. There is a common belief that it was introduced from 

 Chile. 



In the Great Basin country, especially in Utah, a large number 

 of the weeds are of European origin. Of the most common of 

 these mention may be made of the brome grasses (Bromus brizae- 

 formis and B. tectorum), bouncing Betty (Saponaria vaccaria), 

 black medick (Medicago lupulina), dodders (Cuscuta arvensis and 

 C. epithymum) , poison hemlock (Gonium maculatum), moth mul- 

 lein (Verbascum blatt aria) , mint {Mentha viridis) , Russian thistle 

 (Salsola kali var. tenuifolia) , horehound (Marrubium vulgare), 



Fig. 551. Awned Brome Grass (Bromus tectorum). Common in the Great 

 Basin country and California, occasionally in Iowa. 



