PREFACE. 



This little niaiuial represents a revision of the author's 

 former "Trees of Ohio and Surrounding Territory," and 

 attempts to. carry out more definitely the idea of having a 

 convenient guide iby Avhich it is possible to study our trees 

 at any season of the year. The keys have been made very 

 complete so that no difficulty should be encountered in identi- 

 Hcation except in the case of closely related species. No 

 elaborate technical descriptions have been given but a few 

 brief notes are added in connection with each species, calling 

 attention to economic, ecological, or other data of general 

 interest. Characters given in the keys are usually not re- 

 peated in the descriptions. A definite characterization is 

 also given for each genus. This will be found to hold for 

 all the species occurring in our region and in most cases 

 for all the species of the genus. 



The nomenclature used is essentially that of Britton and 

 Brown's 'Tllustrated Flora of the Northern United States, 

 Canada and the British Possessions." 2nd Edition, 1913. A 

 rather conservative position has been taken in the treatment 

 of species, since many of the forms recently described are 

 regarded as merely elementary varieties either Mendelian or 

 ecological. A single English name is given for each species. 

 These names have been taken mainly from Sudworth's "Check 

 List of the Forest Trees of the United States," which on the 

 whole seems to' be a very satisfactory basis for an appro- 

 priate list. Synonyms will be found in the index. 



Most of our common, cultivated, exotic trees have been 

 included, since these form an integral part of the landscape, 

 in many places more conspicuous than the native species. 



The study of trees may be made a pleasant and profitable 

 pastime at any season of the year for all who have an interest 

 in nature. When the tree has once been identified its 

 peculiarities should be learned l)y direct obsen-alim 



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