IOWA ACADEMY OF SCIENCES. 127 



U. americana L. Winneshiek, Allamakee, Clayton, 

 Dubuque, Jackson, Clinton, and Scott Cos. Woods, common. 



Oeltis occidentalis L. Winneshiek, Allamakee, and Clayton 

 Cos. Rich woods, frequent. 



Morus rubra L. Clayton Co. Near river, infrequent. 



Vrtica gracilis Ait. Winneshiek and Allamakee Cos. Allu- 

 vial soil, frequent. 



Pilea pumila Gray. Winneshiek and Clayton Cos. Rich 

 woods or waste places, frequent. 



Laportea canadensis Gaud. Alluvial soil, frequent. 



Parietaria pennsylvanica Muhl. Winneshiek, Allamakee, 

 and Dubuque Cos. Woods, frequent. 



PLANTANACEvE. 



Plantanus occidentalis L. Jackson Co. Along Mississippi 

 river. 



JUGLANDACE^. 



Juglans cinerea L. Winneshiek, Allamakee, Clayton, and 

 Dubuque Cos. Rich soil, frequent. 



J. nigra L. Winneshiek, Allamakee, Clayton, Dubuque, 

 Jackson, and Scott Cos. Rich soil, frequent. 



Garya alba Nutt. Winneshiek, Allamakee, Clinton, and 

 Scott Cos. Uplands, frequent 



0. amara Nutt. Winneshiek Co. Low grounds, frequent. 



CUPULIFER.^. 



Retula nigra L. Allamakee, Clayton, Dubuque, Jackson, 

 and Clinton Cos. River banks, common. 



B. papyrifera Mars. Winneshiek, Allamakee, Clayton, and 

 Dubuque Cos. Rich woods, common, 



Gorylus americana Walt. Winneshiek, Allamakee, and 

 Dubuque Cos. Uplands, common. 



Ostrya virginica Willd. Winneshiek, Allamakee, and Clay- 

 ton Cos. River bluffs, frequent. 



Carpinus caroliniana Walt. Allamakee, Clayton, and 

 Dubuque Cos. Rolling woods, frequent. 



Quercus alba L. Winneshiek, Allamakee, and Clayton Cos." 

 Uplands, frequent. 



Q. macrocarpa Mx. Winneshiek, Allamakee, Clayton, and 

 Dubuque Cos. Upland woods, common. 



