10 
are of special interest has been given. The nomenclature conforms 
to that of the United States Forest Service, and when it differs 
from Gray’s Manual, 7th edition, the synonym is given after the 
common name. The common names are those commonly or locally 
used in this State, and when text-book common names are given 
they are so indicated. ‘The names are arranged in the order of 
the frequency in which they are used, the most common being 
first. In naming the associate trees, they have been arranged in 
the order of their frequency, the first being the most numerous. 
The Malaceae (Apple Family) has been contributed by W. W. 
Eggleston of the Bureau of Plant Industry, Washington, D. C., 
who is a specialist in this group. 
Distribution——The general distribution is given first, which is 
followed by the distribution in Indiana. The number of individ- 
uals occurring on a given area is defined by using the terms common, 
frequent, rare, etc., which have no definite meaning, so the follow- 
ing arbitrary meanings have been attached to the following words 
and carefully followed throughout: very common, more than 25 
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 tree to 
every 11-100 acres; very rare, 1 tree to more than 100 acres; local, 
when the distribution is circumscribed or in spots. 
The published records of the distribution of each species include 
only those where the name and county or locality are definitely 
given. When an author mentions one or more trees and the loca- 
tion incidentally, or when an author is not discussing the trees of 
the State, such publications are not credited. In considering some 
of the older publications it should be borne in mind that scientific 
accuracy was not as rigorously demanded as at present, and that 
some of the authors were not trained botanists. When errors in 
such publications are beyond dispute, attention has been called to 
them. There are other records that are questionable, and atten- 
tion will be drawn to them when it is noted that they are beyond 
the known range of the species in the State. ) 
Additional records are those based on existing specimens de- 
posited in the following herbaria: Deam, Bluffton; Depauw Uni- 
versity, Greencastle; Grimes, Russellville; Lilly, Indianapolis; Pur- 
due University, Lafayette; Wakash College, Crawfordsville. 
The fact that a tree is not given as occurring in certain counties, 
does not imply that it is not found there, but that it has not been 
reported. It is believed that about one-half of our trees are found 
in nearly every county of the State. 
