1110 



The result of the study of the Indiana flora is shown in the following 

 table. 



Flora of 1881 lists 1,194 native species; 140 introduced. 

 Flora of 1900 lists 1,400 native species; 177 introduced; 188 excluded. 

 Flora of 1940 lists 1,838 native species; 302 introduced; 707 excluded. 



To the last flora should be added 292 varieties and 98 forms. 



What a census of our flora will show 25 years hence is mere conjecture. 

 I believe our native flora will never exceed 1,900 native species. Some of the 

 present species may be reduced in rank to varieties while some varieties 

 may be elevated to species but the number of new native species discovered 

 will be few. There are a number of species found in Michigan just 

 north of our border which may be found in Indiana. Doubtless there 

 are some southern species as yet undiscovered in the unglaciated region. 

 The introduction of foreign plants will steadily increase, and western 

 species will become established because of the interstate highway traffic. 

 Our pure seed law will lessen introduction in grass and grain seed but 

 I believe we already have many species established that came to us in 

 cheap imported seed during the World War that have not been discovered. 

 A rich field to botanize for foreign and western plants will be railroads, 

 highways, land about factories, cemeteries, and tourist camps. 



The study for this flora is based upon Indiana specimens or duplicates 

 seen in the following private and public herbaria. 



Banta, Edna 1,018 



Butler University 9,347 



DePauw University 3,736 



Field Museum of Natural History 704 



Franklin College 326 



Hermann, Frederick J 804 



Illinois (University of) 231 



Indiana University 3,710 



Kriebel, Ralph M 1,719 



Lyon, Marcus W., Jr 972 



McCoy, Scott 1,986 



