venting the growth of useful forage plains. Cattle will avoid it 

 in all conditions. It is difficult bo exterminate, as it has a \<-i\ 

 long tap loot and is a perennial. 



Polygonum aviculare, L. Knotgrass. 



A common dooryard weed. 



Polygonum convolvulus^ L. Black Bindweed. 



Common in cultivated grounds and grain fields in loamy soil. 



Polygonum erectum, L. 



Common in dooryards, etc-. 



Polygonum persicaria, L. Smart weed. 



In waste places, and low grounds, rich soil. 



Polygonum hydropiper, L. Common Smartweed. 



Common in moist and wet grounds. 



EUPHORKIACEAE. 



Euphorbia cyparissias, L. Cypress Spurge. 

 Escaping from several cemeteries, La Crosse and North Bend,. 

 Wis., and La Crescent, Minn. 



Euphorbia maculata, L. Creeping Spurge. 



Common along roadsides, in dooryards, and on sandy soil. 



URTICACEAE. 



TJrtica gracilis, Ait. Nettle. 

 Common along fences, hedges, etc. 

 Cannabis sativa, L. Hemp. 



This weed is common along roadsides, especially in light loamy 

 soil. 



GRAMINEAE. 



Panicum capillare, L. Old Witch Grass. 

 Common in sandy soil and cultivated fields. 

 Panicum crus-gaM, L. Barnyard Grass. 

 In rich and wet soil, common. 



Panicum sanguinafe. L. Common Crab or Finger Grass. 

 Becoming numerous along roadsides. 

 Muhlenbergia mexicana, Trin. 



Common along the borders of woods, fences, in damp clay and 

 loamy soils. • 



Setaria glauca, Beauv. Fox-tail Grass. "Pigeon Grass." 

 A common weed in stubble, poor meadows, etc. 

 Setaria viridis, Beauv. Green Fox-tail Grass. "Pigeon Grass. 7 ' 



