403 



the reported distribution in the State. Some maps covering these fea- 

 tures reveal several matters of interest. First, it becomes evident that 

 the definition of the general limits of any species is a big task, always 

 changing, and a graphical representation of a number of species for 

 Indiana shows quite clearly, among ether things, that some counties 

 have been quite thoroughly worked, whereas others have had little or 

 no attention at all. Elkhart, Benton, Clinton, Jasper, Newton, Ohio, 

 Perry, Pike, Pulaski, Rush, Switzerland, Tipton, Vanderburgh, Warrick, 

 Whitley and White Counties are not mentioned in a single published 

 report. As the maps show, the counties bordering on the Wabash River 

 and extending in a continuous line from Posey to Steuben County, have 

 been the most thoroughly worked, as have Wells County (by Deam), 

 the group of Delaware, Jay, Randolph and Wayne (by Phinney), Jef- 

 ferson (by Coulter), Clark (Baird and Taylor), area of New Albany, 

 Floyd (Clapp), Hamilton (Wilson), and Franklin (Meyncke). (See 

 Range maps pp. 424-429, 444, 450, 453, 456, 460, 461.) 



Nearly two decades ago Dr. Cowles of the University of Chicago 

 made an ecological study of the shores of Lake Michigan. The results 

 of his investigations were published in the Botanical Gazette. Though 

 none of these contain a definite list of plants for the bordei's of the 

 Indiana Dune area on Lake Michigan, I have been able to pick out a 

 number of trees mentioned in the articles as occurring in that area. 

 And since these references seem to have had no acknowledgments in 

 later records, I include a list of trees below, taken mostly from the 

 Botanical Gazette, Vol. 27, No. 4, April, 1899. Most of the species 

 occur at Dune Park in Porter County. 



(List 4.) 



Some Trees of the Dune Area of Indiana. 



Pinus strobus L. 



Banksiana Lamb. 

 Abies balsamea (L) Mill. 

 Tsuga canadensis (L) Carr. 

 Thuja occidentalis L. 

 Juniperus virginiana L. 

 communis L. 



