TREES OF THE MISSOURI BASIN 
31 
elm, red and bur oaks, hickory, basswood, cottonwood, white 
willow, black walnut, green and white ash, and hackberry. 
Harrison County . — The bluff lands bordering the Missouri 
river in Harrison county are very much broken up by the large 
rivers flowing in a southwesterly direction into the Missouri 
river. The area back from the bluffs is an undulating prairie 
country. The native timber is found adjoining the watercourses 
and the more important species are the following : black walnut, 
green ash, soft maple, cottonwood, bur and red oaks, boxelder, 
hackberry, white willow, black willow^, shellbark hickory, bitter- 
nut hickory, white and red elms, and basswood. Von Bayer also 
reports the white oak. 
A considerable amount of planted timber is to be found in 
the county. The soft maple probably has been planted as much 
as any other species. Other trees which have been planted to 
a considerable extent and which are doing well, are the black 
walnut, cottonwood, hardy catalpa, Kentucky coffee tree, box- 
elder, Norway spruce, Scotch pine and green ash. 
Monona County . — Monona county bounds the Missouri river 
and occupies the position about midway between the north and 
south boundaries of the state. The flood plain adjacent to the 
Missouri river occupies about nine per cent of the total area of 
the county. The remainder consists of bluffs, ridges and 
rolling country. On the uplands there is a considerable growth 
of bur oak, sumach and wolfberry. The natural growth of timber 
between Mapleton and Soldier consists of willow, ash, elm and 
bur oak. The bur oak covers considerable areas of high land. 
In general, the timber of the county is confined to the Missouri 
river and the bluffs of the Little Sioux. The timber along the 
Missouri is largely cottonwood, the best stands of which have 
been cut. The newly formed sand-bars of the river are soon 
covered with a growth of willows and cottonwood. In this sec- 
tion the flood plain is badl}^ cut by the action of the river. A 
heavy stand of timber does not prevent the meandering of the 
stream. 
In this county the cottonwood has been planted probably more 
extensively than any other species. Soft maple, honey locust 
and black walnut plantations are also frequently found. 
Woodbury County . — The north part of Woodbury county is 
very hilly. The soil consists of the Missouri loess. Timber has 
been planted in the county principally for windbreaks and 
