2Jo WEEDS OF THE FARM AND GARDEN 



Common Sunflower (Helianthus annuus, L.). A tall, 

 rough annual, six to eight feet high with three-ribbed, 

 ovate, the lower sometimes cordate, serrate leaves ; heads 

 large with yellow ray-flowers and brownish disk-flowers. 



*'ig 150. Young cocklebur (Xanthium canadense). (Am. Steel 

 and Wire Co.) 



Native in the western part of the state and especially 

 troublesome in the alluvial soils of the Missouri River 

 valley. Has been carried to other sections by railroad 

 traffic and is now found in many other states of the 

 Mississippi Valley. 



Prairie Sunflower (Helianthus petiolaris, Nutt.). 

 Smaller than the common sunflower, grows from one to 

 three feet high ; lower branches somewhat rough ; stem leaves 

 one to three inches long, oblong to ovate-lanceolate, sparingly 



