u 



When the term twig is used, it means the growth of the year. Branch- 

 lets and branches mean all growth except the present year. By seasons 

 are meant the calendar seasons. 



The size of trees is designated as small, medium and large. These 

 terms are defined as follows: Small trees are those that attain a diameter 

 of 2 dm.; medium-sized trees are those whose maximum diameter is 

 between 2 dm. and 6 dm. ; large-sized tit'cs are those which are common- 

 ly more than 6 dm. in diameter. Diameter measurements are at 

 14 dm. (ii'2) feet above the ground, or breast high. 



The common names given are those most generally used in our area. 

 Where common names are rarely applied to our forms, the common 

 commercial or botanical common name is given. In some instances 

 where a tree is known bj' seveial names, one or more of which are often 

 applied to a related species, the liberty has been taken to select a 

 common name which should be restricted to the one species. 



Botanical names are usuallj' pronounced according to the English 

 method of pronouncing Latin. The accented syllables have been 

 marked as follows: the grave ( \) accent to ind'.cate the long English 

 sound of the vowel and the acute (/) accent to show the short or 

 otherwise modified sound. 



Measurements have been given in the metric system, and in some 

 instances the English eciuivalcnt has also been given. 



The noanenclature attempted is that of the International Code. 

 The sequence of families is that of Gray's Manual, 7th Edition. 



Disiribiilion. — The genera' distrilnition of the species is first 

 given, which is followed by the distribution in Indiana. The general 

 distribution has been obtained by freely consulting all the local floras 

 and general works on botany. The Indiana distribution has been 

 obtained for the greater part from specimens represented in the writer's 

 herbarium and from notes in doing field work during the past 24 years. 

 Since the first edition of the "Trees of Indiana" was published the 

 writer has traveled over 27,000 miles in Indiana, via auto, making a 

 special study of the floi'a of the State, and has visited every county and 

 has traversed practically every township in the State. In discussing 

 numbers in distribution it was decided to use tei'ms already in common 

 use, but to assign a definite meaning to each as follows: Very common 

 means more than 2.5 trees to the acre; common, 5-25 trees to the acre; 

 frequent 1-5 trees to the acre; infrequent, 1 tree to 2-10 acres; rare, 

 1 ti'ce to evci-y 11-100 acres; very rare, 1 tree to more than 100 a(^res; 

 local when the distribution is circumscribed or in spots. 



Where a species has the limit of its range in our area, its distribution 

 is sometimes given .at length for scientific reasons. It should be re- 

 membered tliat some of the older records of distribution were made by 



