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 woody 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 steins 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 mosth' 

 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 lOG 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, CxYMNOSPERMAE. 



Class, CONIFER.\E. 



Order, Finales. 



Family- Pinaccae. 



1. Pinus strobus L. White Pine. 



2. " virginiana Mill. Scrub Pine. 



3. " echinata Mill. Yellow Pine. 



4. " rigida Mill. Pitch Pine. 



5. Larix laricina (DuR.) Koch. Tamarack. 



6. Tsuga canadensis (L.) Carr. Hemlock. 



Family, Ju >upcraccae. 



7. Thuja occidentalis L. Arborvitae. 



8. Juniperus communis L. Common Juniper. S. T. 



9. " virginiana L. Red Juniper. 



