IOWA ACADEMY OF SCIENCES. 151 



C. tripteris Li. Decatur and Johnson Cos. Prairies and open 

 woods, frequent. 



G. involucrata Nutt. Decatur and Johnson Cos. Wet grounds, 

 common. 



Bidens frondosa L. Decatur, ApjDanoose, and Johnson Cos. 

 Low grounds, common. 



B. connota Muhl. Decatur and Johnson Cos. Low grounds, 

 frequent. 



B. cernua L. Decatur and Johnson Cos. Wet grounds, low 

 woods, frequent. 



B. chrysanthemoides Mx. Decatur and Johnson Cos. Low 

 waste places, frequent. 



Helenium autumnale L. Decatur, Appanoose, Des Moines, 

 and Johnson Cos. River banks, moist places, frequent. 



Dysodia chrysanthemoides Lag. Decatur, Appanoose, W apello, 

 Van Buren, Shelby, and Johnson Cos. Waste places, common. 



Anthemis cotula DC. Decatur, Appanoose, Wapello, Van 

 Buren, Des Moines, Shelby, and Johnson Cos. Waste places, 

 common. 



Achillea millefolium L. Decatur, Appanoose, Van Buren, 

 Shelby, and Johnson Cos. Fields and waste places, common. 



Chrysanthemum leucanthemum L. Decatur and Johnson Cos. 

 Waste places, infrequent. 



Tanacetum vulgare L. Decatur and Johnson Cos Waste 

 places near dwellings, infrequent. 



Artemisia biennis Willd. Degatur, Appanoose, Wapello, and 

 Johnson Cos. Waste places, frequent. 



A. ludoviciana ^utt. Decatur and Johnson Cos. Waysides 

 and fields, common. 



Senecio aureus L. Johnson Co. Rich woods, infrequent. 



S. aureus balsamitce T. & G. Page, Decatur, Shelby, and 

 Johnson Cos. Rich woods, common. 



Cacalia reniformis Muhl. Johnson Co. Woods, infrequent. 



C. atriplicifolia L. Decatur, Van Buren, and Johnson Cos. 

 Rich woods and prairies, frequent. 



G. tuberosa Nutt. Decatur, Appanoose, and- Shelby Cos. 

 Moist prairies, frequent. 



Erechtites hieracifolia Raf. Decatur and Johnson Cos. Open 

 woods, frequent. 



Arctium lappa L. Decatur, Appanoose, Van Buren, Des 

 Moines, and Johnson Cos. Waste places, frequent. 



