202 IOWA ACADEMY OF SCIENCES 



Urticace^. 



UhuHs racemosa Thomas. Hickory Elm. Rock Elm. 

 Not common. There were several large groves in an 

 early day on North River. A few trees are now 

 found about the mouth of North Branch. 

 Celtis occidentalis Linn. Hackberry. 



Common on river bottoms and along ravines. 

 Monis rubra Linn. Red Mulberry. 

 Not common. River bottoms. 



Platanacb^. 

 Platanus occidentalis Linn. Sycamore. Buttonwood. 

 Along streams near water's edge and old river chan- 

 nels on gravel beds. Union and Douglas townships. 



JUGLANDACE^. 



Jughnis cinerea Linn. Butternut. 



White Walnut. Common on rich river bottoms; trees 

 have been cut two and one-half to three feet in 

 diameter. 

 Juglans 7iigra Linn. Black Walnut. 



This tree was very common in an early day on the 

 rich bottoms, but the large trees have all been cut. 

 They were sold and shipped East. In early days 

 rails were split from the best logs. There are many 

 groves of young trees. 

 Car 11 a alba Nutt. Shell bark Hickory. 



Common on the uplands. 

 Carija amara Nutt, Bitternut. 

 Common everywhere. Trees on the upland are dying 

 from the effects of drouth and pasturing. 



CUPULIFER^. 



Corylus americana Walt. Hazelnut. 

 Very abundant on the outskirts of the timber, and 

 where the trees are small and scattered. 

 Ostri/a virginica Willd. American Hop-Hornbeam. 



Ironwood. Common along steep hillsides. 

 Quercus alba Linn. White Oak. 

 Common on clay ridges. 



