TREE SPECIES. 37 
extend up the North Platte River farther than Lincoln County. It 
occurs along the Niobrara to the western part of Cherry County, and 
is common in Sioux and Dawes counties. It ordinarily makes a 
fine, shapely tree of gooé size (see Tables VII, VIII, IX, XI, and 
XIT), and furnishes strong, tough wood, valuable for many local uses 
and for fuel. 
SLIPPERY ELM. 
The slippery elm (Ulmus pubescens) is a smaller tree than the 
white elm, has a more restricted range, and is ordinarily much less 
frequent, yet in Rawlins County, Kans., the slippery elm is much the 
more abundant of the two. The wood is less strong than that of white 
elm, but answers for many purposes and makes good fuel. 
HACKBERRY. 
The hackberry (Celtis occidentalis) is common in Kansas and 
Nebraska. Isolated clumps of it are even found in the sand hills, far 
from any other timber. Ordinarily it occupies a subordinate place in 
the forest, but it sometimes predominates (see frontispiece). The 
hackberry is a very hardy tree and can adapt itself to poor soils and 
dry situations. Under such conditions it grows slowly and is low 
and scrubby. In favorable localities it develops quite rapidly, and 
forms a shapely tree of moderate size. The wood is moderatety 
strong and tough, and is used for the same purposes as elm. 
RED MULBERRY. 
The red mulberry (J/orus rubra) is a rather small tree of moderate 
erowth, occurring rarely in Smith, Osborne, and Russell counties, 
but quite abundantly in Barber”™ and Comanche counties, Kans. 
The largest have a diameter breasthigh of nearly 18 inches. The 
wood is moderately strong, very durable, and makes good posts. 
VALLEY MAHOGANY. 
Though listed as a tree, this species (Cercocarpus parvifolius) 1s 
only shrubhke in Nebraska. It is found on the bluffs in Cheyenne, 
Banner, and Scotts Bluff counties, but is of little importance. 
WESTERN SERVICEBERRY. 
The western serviceberry (Amelanchier alnifolia) is a rather small, 
bushy tree, found in Rock, Scotts Bluff, Banner, and Cheyenne coun- 
ties, Nebr. It is very plentiful in some places and is valuable for its 
fruit. 
