THE FOREST TREES OF EASTERN NEBRASKA. 
BY CHAELES E. BESSEY. 
In Studying the distribution of the native forest-trees of Nebraska, I 
have evidence that most of them have migrated up the Missouri river 
and weste5vard from it up the rivers which empty into it from the west- 
erly side. A few species have come down from the Rocky Mountains and 
migrated eastward for greater or less distances. 
It has long, been my wish to arrange for a joint survey of the two 
sides of the Missouri river, having for its object the determination of 
the question of the rapidity of migration of plants on the two banks, and 
I present the following report in the hope that the Iowa botanists may be 
ready to join with those of Nebraska in making such a survey wdth refer- 
ence to the tree flora. 
Family Pinaceae. 
Of our three native species only one occurs in eastern Nebraska. 
Eastern Red Cedar {Juniperus virginiana L.) is found scattered over 
the eastern United States, and occurs in the various bodies of forests 
eastward of Nebraska. From these it has moved westward up the river 
valleys fully two-thirds of the distance across the state (2). 
Family Anonaceae. 
Papaw {Asimina triloba (L.) Dunal). The large fleshy fruits which 
contain about eight large hard seeds are edible, and are picked up and 
carried off, or eaten direci-iLy by various quadrupeds. In either case it hap- 
pens that some of the seeds are carried some distance from the parent 
trees. This species is very common in the Missouri forests, from which 
it has moved up the river valleys (4) in southeastern Nebraska (Richard- 
son to Pawnee, Nemaha, Otoe, and Saunders counties). 
Family Saltcaceae. 
Black Willow (Salix nigra Marsh.) is common in the Missouri for- 
ests, from which it has spread up the streams, apparently across the 
state (5). 
Aimond Willow (Salix amygdaloides And.) is found abundantly in the 
Missouri forests, and has followed the river valleys across the Plains to 
the Rocky Mountains (6) and even to Oregon. 
....lining Willow {Salix lucida Muehl.) occurs in the Missouri forests 
and has moved up the river to Cass county (7). 
Sand-bar Willow {Salix fluviatilis Nutt.) is abundant in the Missouri 
forests, from which it has extended up the river valleys, across the plains 
tf the Rock Mountains (8), California and Oregon. 
( 75 ) 
