212 



Seiiecio Plattensis, Nutt. Prairie Ragwort. 

 In dry ground in the Black Hills. 



Seiiecio Balsaiiiit?e, Muhl. Balsam Groundsel. 

 Senecio aureus Balsamitcr^ T. & G. 



On prairies from the Missouri valley eastward and in 

 the Black Hills; common. 



Senecio aureus, L. Golden Ragwort. 



In low, wet ground in the Minnesota and Sioux valleys. 



Seiiecio Doug-lasii, DC. Douglas' Ragwort. 



In dry soils in the plains region, along the Cheyenne 

 river. 



Senecio palustris, (L.) Hook. Marsh Ragwort. 



In swamps in the Minnesota and Sioux valleys. 



Senecio vulgaris, L. Common Groundsel. 



Occurs in cultivated and waste ground in the Minne- 

 sota and Sioux valleys. 



Senecio ereiuopliilus, Richards. Mountain Ragwort. 

 On dry soils in the Black Hills. 



Senecio rapifolius, Nutt. 



In shady places in the Black Hills. 



Senecio discoideus, (Hook.) Britton. Northern Squaw 

 Weed. 



In moist ground in the Missouri valley, Charles Mix 

 county. The specimens are typical, except that the 

 achenes are sharply four-sided and hairy on the angles. 



Arctium minus, Schk. Common Burdock. 



Sparingly naturalized in shady waste places in the 

 southern part of the Sioux valley and in the Minnesota 

 valley. 



Carduus altissimus, L. Roadside Thistle. 

 Cnicus altissimus^ Willd. 



In fields, woods and waste places in the Minnesota 

 and Sioux valleys. 



