202 
IOWA ACADEMY OF SCIENCES 
Urticacea:. 
Ulmus 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. 
Morus rubra Linn. Red Mulberry. 
Not common. River bottoms. 
Platanace^e. 
Platanus occidentalis Linn. Sycamore. Buttonwood. 
Along streams near water’s edge and old river chan- 
nels on gravel beds. Union and Douglas townships. 
JuOLANDACEiE. 
Juglans cinerea Linn. Butternut. 
White Walnut. Common on rich river bottoms; trees 
have been cut two and one-half to three feet in 
diameter. 
Juglans nigra 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. 
Carga alba Nutt. Shellbark Hickory. 
Common on the uplands. 
Carga amara Nutt. Bitternut. 
Common everywhere. Trees on the upland are dying 
from the effects of drouth and pasturing. 
Cupulifera:. 
Corylus americana Walt. Hazelnut. 
Very abundant on the outskirts of the timber, and 
where the trees are small and scattered. 
Ostrga virqinica Willd. American Hop-Hornbeam. 
Ironwood. Common along steep hillsides. 
Quercus alba Linn. White Oak. 
Common on clay ridges. 
