IOWA ACADEMY OF SCIENCES. 239 



159; Pammel, Weed Pests, Bull. la. Agrl. Exp. Sta. 13: 72; 

 Notes on Some Intr., PI. 114; Some Obnoxious Weeds, 

 445, p/ 5; Weeds of Cornfields 41, 2 f.; Halsted, Prel. List 

 la. Weeds. 42; Fitzpatrick, Fl. N. E. la. 120. 



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