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Carduiis discolor, (Muhl.) Nutt. Field Thistle. 

 Cnicus discolor^ Muhl. 



On prairies in the Minnesota and Sioux valleys. 



Carduus Virginiaiius, L. Virginian Thistle. 

 Cnicus Virginiaiius^ Pursh. 



In woods and thickets in the Minnesota and Sioux 

 valleys. 



Cardviiis uiidulatus, Nutt. Wavy-leaved Thistle. 

 Cnicus uiidulatiis^ Gray. 



On plains and prairies throughout the state. 



Carduus ochroceiitrus, (Gray.) Green. Yellow-spined 

 Thistle. 

 Cnicus ochroccnirus^ Gray. 



In dry soils in the Black Hills. 



Carduus Plattensis, Rydberg. Prairie Thistle. 



In sandy soils in the southwestern part of the state. 



Cardvius Druuiuioudi, (Gray). 

 Cnicus Drumniondi^ Gray. 



In damp meadows in the Black Hills. 



Carduus Caruovireus, Rydberg. 



Collected near Sylvan lake in the Black Hills, by 

 Mr. L. W. Carter. Specimens sent Dr. Rydberg were 

 identified as this species. 



Carduus arveusis, (L.) Robs. Canada Thistle. 



Cnicus arvensis^ Hoff. 



Sparingly naturalized in the Sioux valley. 



Centaurea Cyauus, L. Blue Bottle. Corn Flower. 

 Roadsides near Hot Springs in the Black Hills. 



