196 IOWA ACADEMY OF SCIENCES. 



Morus rubra L. Fremont county. Low woods; frequent. 



Urtica gracilis Ait. Clarke, Montgomery, Pottawattamie, 

 Page, and Fremont counties. Low grounds; common. 



Laportea canadensis Gaud. Ringgold and Fremont counties. 

 Moist woods; common. 



Pilea xmmila Gray. Ringgold and Page counties. Damp 

 woods ; frequent. 



Parietaria 'pennsylvanica Muhl. Decatur, Union, Page, and 

 Pottawattamie counties. Low woods; frequent. 



Platanace^. 



Platanus occidentaUs. Page and Fremont counties. Bottoms; 

 frequent. 



JUGLANDACE^. 



Juglans nigra L. Union, Montgomery, Pottawattamie, 

 Ringgold, Page, Taylor, and Fremont counties. Rich woods; 

 common. 



Garya alba Nutt. Taylor, Page, Pottawattamie, and Fre- 

 mont counties. Upland woods; common. 



C. amara Nutt. Ringgold, Taylor, Page, Fremont, Mont- 

 gomery, and Pottawattamie counties. Rich woods; common, 



CUPULIFER^. 



Betula nigra L. Ringgold county. 



Corylus americana Walt. Clarke, Adams, Montgomery, Pot- 

 tawattamie, Ringgold, and Page counties. Thickets; common. 



Ostrya virginica Willd. Union and Fremont counties. Bluffs; 

 frequent. 



Quercus alba L. Union and Ringgold counties. Woods; 

 common. 



Q. macrocarpa Mx. Union, Adams, Montgomery, Pottawat- 

 tamie, Ringgold, Taylor, Page, and Fremont counties. Woods; 

 common. 



Q. bicolor Willd. Ringgold county. Low woods; frequent. 



Q. muhlenbergii Englm. Union, Adams, Montgomery, Ring- 

 gold, and Fremont counties. Upland woods; frequent. 



Q. rubra L. Union, Montgomery, Pottawattamie, Ringgold, 

 Taylor, Page, and Fremont counties. Woods; frequent. 



Q. coccinea Wang. Ringgold, Fremont, and Pottawattamie 

 counties. Upland woods; common. 



Q. imbricaria Mx. Clarke, Union, and Ringgold counties. 

 Upland woods and thickets; common. 



