Feb., 1906.] 
Check List of Ohio Trees. 
457 
CHECK LIST OF OHIO TREES. 
John H. Schaffner 
Ohio lies in the great deciduous forest region which extends 
from the Appalachian Mountains to the Mississippi River. This 
region was formerly one of the grandest woodland areas in the 
temperate zone. But the forest is rapidly disappearing before 
the civilization of the white man. 
In the list given below the introduced species have been 
marked by the abbreviation “I.”, and those which are usually 
small or shrub-like by “S. T.” In attempting to separate 
“trees” from the larger “shrubs,” one must necessarily be some- 
what arbitrary, as nature draws no definite division line. A 
tree may be defined as a wood}' plant of any size which pro- 
duces naturally one main erect stem with a definite crown of 
branches ; while a shrub is a woody plant which produces small, 
irregular or slanting stems usually in tufts. The species may 
develop in various ways depending on the environment. Thus 
the writer has seen individuals of the poison ivy (Rhus radicans 
L.) develop as climbers, shrubs, and small “trees” in an area 
only a few rods in extent, the conditions being favorable for all 
three modes of growth. 
In the present list, an attempt has been made to give the 
appropriate English name for each species. These have mostly 
been taken from Sudworth’s “Check List of the Forest Trees of 
the United States.” Hybrids and mere forms have not been 
included. 
Of the 155 species listed as occurring in Ohio, 128 are native 
and 27 are introduced; about 106 are typical trees and 49 are 
small trees or shrub-like. Of the typical trees, 85 are native 
and 21 are introduced; and of those developing as small trees or 
shrubs, 43 are native and 6 are introduced. 
Subkingdom, GYMXOSPERMAE. 
Class, CONIFER.\E. 
Order. Finales. 
Family. Pinaceae. 
1. Finns strobus L. White Pine. 
2. “ virginiana Alill. Scrub Pine. 
3. “ echinata Mill. Yellow Pine. 
■1. “ rigida IMill. Pitch Pine. 
.5. Larix laricina (DuR.) Koch. Tamarack. 
6. Tsuga canadensis (L.) Carr. Hemlock. 
Family, Juniperaccae. 
7. Thuja occidentalis L. Arborvitae. 
8. Juniperus communis L. Common Juniper. S. T. 
9. “ virginiana L. Red Juniper. 
