Trees of Indiana 



INTRODUCTION 



The present edition has been entirely rewritten. While the general 

 plan of the first edition has been followed, some changes have been 

 made. 



The number of trees included has been wholly arbitrary. All woody 

 plants of the State which generally attain a maximum diameter of 

 10 cm. (4 inches) at breast high are regarded as tree forms. Alnus 

 rugosa which so closely resembles Alnus incana, is an exception, and a 

 description of it is given to aid in the identification of our tree form of 

 Alnus. Also several species of Cratsegus are included which commonly 

 do not attain tree size. The species of all Cratsegus begin to flower 

 and fruit many years before they attain their maximum size. The 

 genus is much in need of study, and the smaller forms are included 

 to stimulate a study of the genus, and in order that the larger forms 

 may be more easily and certainly identified. 



The number of introduced trees has been limited to those that more 

 or less freely escape at least in some parts of the State. The one excep- 

 tion is Catalpa bignonioides, which is given to help separate it from 

 our native catalpa, both of which are now commonly planted. 



Botanic Description. The botanic descriptions have been made 

 from specimens collected in Indiana. In most instances the material 

 has been quite ample, and collected from all parts of the State. Tech- 

 nical terms have been avoided, and only when precision and accuracy 

 were necessary have a few been used which can be found in any school 

 dictionary. The length of the description varies in proportion to the 

 importance and interest of the species and the number of characters 

 necessary to separate it from other forms. The characters used are 

 those which are the most conspicuous, and are generally with the 

 specimen at hand. In most instances mature leaves are at hand, and 

 these are most fully described. When leaves are discussed, only mature 

 and normal leaves are considered. The descriptions are not drawn to 

 include the leaf forms, and sizes of coppice shoots or seedlings. 

 Measurements of simple leaves do not include the petiole unless 

 mentioned. 



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