162 IOWA ACADEMY OF SCIENCES. 



D marginata Pursh. Decatur, Van Buren, and Johnson Cos. 

 Waste places, infrequent. 



E. corollata L. Decatur, Appanoose, Wapello, Van Buren, 

 Des Moines, Shelby, and Johnson Cos. Fields, prairies, and 

 open woods, common. 



E. heterophylla L. Wapello, Van Buren, and Johnson Cos. 

 Rocky wooded banks, frequent. 



E. dentata Mx. Des Moines Co. Waste places near rail- 

 road, frequent. 



E. obtusata Pursh. Johnson Co. Sandy soil in woods, infre- 

 quent. 



E. cijparissias L. Shelby, Henry, and Johnson Cos. Waste 

 places, infrequent. 



Croton glandulosus L. Des Moines Co. Waste places near 

 railroad, frequent. 



Acah/pha virginica L. Decatur, Van Bjren, and Johnson 

 Cos. Fields and waste places, common. 



URTICACE^E. 



Ulmus fulva Mx. Decatur, Appanoose, and Johnson Cos. 

 Rich woods, frequent. 



U. americana L. Page, Decatur, Appanoose, Wapello, Van 

 Buren, Des Moines, Shelby, and Johnson Cos. Low woods, 

 common. 



Celtis occidentalis L. Decatur, Appanoose, and Johnson Cos. 

 Low woods, frequent. 



Cannabis sativa L. Decatur, Van Buren, Des Moines, Shelby, 

 and Johnson Cos. Waste places, frequent. 



Humulus lupulus L. Decatur, Appanoose, and Johnson Cos. 

 Waysides and thickets, common. 



Madura aurantiaca Nutt. Decatur, Appanoose, Shelby, and 

 Johnson Cos. Formerly much used for hedge fences, some- 

 times spontaneous. 



Morns rubra L. Decatur, Appanoose, Des Moines, and 

 Johnson Cos. Rich woods, frequent. 



Urtica gracilis Ait. Decatur Co. Alluvial soil, infrequent. 



Pilea pumila Gray. Decatur, Des Moines, and Johnson Cos. 

 Rich woods, common, 



Laportea. canadensis Gaud. Decatur, Appanoose, and John- 

 son Cos. Moist woods, common. 



Boehmeria cylindrica Willd. Johnson Co. Moist woods, fre- 

 quent. 



