208 IOWA ACADEMY OF SCIENCES. 



Viburnum prunifolium L. Black haw. Quite common on low, 

 rich ground. 



OLEACE^. 



Fraxinus americana L. White Ash. Very commoa. North 

 of Webster City a tree was found three feet in diameter and 

 seventy-five feet high. 



Fraxinus sambucifolia Lam. Black ash. Common on low 

 bottom land. Trees were found sixty feet high and eighteen 

 inches in diameter. 



URTICACE^. 



Ulmus fulva Michx. Slippery or red elm. Common in 

 upland woods. 



Ulmus americana L. White, or American elm. Very com- 

 mon on banks of streams and low lands. Planted for shade 

 and street trees. 



Ulmus racemosa Thomas. Rock or cork elm. Rare. River 

 bottom. 



Celtis occidentalis L. Hackberry. Quite common along the 

 river bottoms. 



JUGLANDACE^. 



Juglans cinerea L. Butternut. White walnut. Common on 

 bottoms and upland. 



Juglans nigra L. Black walnut. Very common along the 

 rich river bottoms. The most valuable trees have been cut 

 and shipped to the east. 



Carya alba Nutt. Shell bark hickory. Common in upland 

 woods. 



Carya amara Nutt. Bitternut. Very common on hillsides 

 and upland. 



CUPULIFER^. 



Corylus americana Walt. Hazelnut. Very common in open 

 woods and along the border of the prairies. 



Ostrya virglnica Willd. Ironwood. Common along the small 

 streams. 



Quercus alba L. White oak. Not common. Pound on high 

 clay points. 



Quercus macrocarpa Michx. Bur oak. Very common every- 

 where, most abundant on upland. A valuable tree for fence 

 posts. 



