126 IOWA ACADEMY OF SCIENCES. 



POLYGONACE^E. 



Rumex britannica L. Winneshiek and Allamakee Cos. 

 Rich soil, common. 



R. altissimus Wood. Winneshiek, Allamakee, and Clayton 

 Cos. Rich soil, common. 



R. verticillatus L. Winneshiek and Allamakee Cos. Wet 

 ground, frequent. 



R. obtusifolius L. Winneshiek Co. 



R. crispus L. Winneshiek, Allamakee, Clayton, and 

 Dubuque Cos. Rich soil, wayside and waste places, common. 



R. acetosella L. Winneshiek and Allamakee Cos. Culti- 

 vated fields, frequent. 



Polygonum pennsylvanicum L. Winneshiek and Clayton 

 Cos. Damp soil, common. 



P. amphibium L. Allamakee Co. Along river. 



P. aviculare L. Winneshiek Co. Waste places, common. 



P. sagittatum L. W T inneshiek Co. Margins of ponds and 

 streams, frequent. 



P. convolvulus L. Dubuque Co. 



P. dumetorum L., var. scandens Gray. Winneshiek, Alla- 

 makee, and Clayton Cos. Fields and woods, common. 



P. tenue Mx. Winneshiek Co. 



ARISTOLOCHIACEJE. 



Asarum canadense L. Winneshiek, Allamakee, and Clayton 

 Cos. Wooded bluffs, frequent. 



THYMEL.EACE.'E. 



Dirca palustris L. Winneshiek Co. 



EUPHORBIACE^E. 



Euphorbia maculata L. Winneshiek, Allamakee, Clayton, 

 Dubuque, Jackson, and Clinton Cos. Waysides, common. 



E. preslii Guss. Winneshiek, Allamakee, and Dubuque Cos. 

 Ways ides, common. 



E. cyvarissias L. Allamakee and Scott Cos. Near old ceme- 

 tery . 



URTICACE^. 



Ulmus fulva Mx. Winneshiek, Allamakee, Clayton, and 

 Dab uque Cos. Rich woods, frequent. 



