153 



Maianthemum Cancuhnse Desf., and Allium cei-nuum Roth., are fountl more com- 

 monlv, but not in tuch abundance as to be termed characteris-tic of tlie region. 

 This only leaves two plants of the list which now remain as characteristic, viz. : 

 Lobelia Knhnti L., and Scutellaria galerieulata L. 



It is true, of course, that Dr. Coulter's "Lake Region " covered mtire terri- 

 tory than the "Lake Region of Northeastern Indiana," but this latter was in- 

 cluded, and formed a very considerable part of it, and the fact that only two of 

 his list can now be called characteristic of our smaller Lake Region has its sig- 

 nificance. 



It must be that the entire north part of the State has undergone a noticeable 

 change in conditions producing its characteristic plants, or that this northeastern 

 part under consideration has alone changed, or that we have here conditions dif- 

 ferent from the remainder of the former Lake Region which were existent at that 

 time. Most of Dr. Coulter's observations were along the line of the L. S. \ M. 

 S. R. R. — largely in St. Joseph County — and only touching our region in Xoble 

 County. 



It is quite probable that the observations at that time did not extend so 

 thoroughly in our region as in the districts to the north and west, where there was 

 not such an a1)undance of lakes and pure lake forms. 



■ The tamarack and associated swamp plants are more frequent in Dr. Coulters 

 list than our present lake plants and swamp plants free from tamarack surround- 

 ings. Our most common species of this latter class, now so abundant, can scarcely 

 be of vei'v recent introduction, and this would seem to show that our pure lake 

 plants were not even then (1886) so abundant in the remainder of Cuulter's 

 Lake Region as in this part of it which we call the Lake Region of Northeastern 

 Indiana, proving more conclusively the distinctiveness of this region. The gradual 

 disappearance of the tamarack is no doubt general throughout northern Indiana, 

 and the list referred to would not include so many characteristic plants for any 

 northern county as when made, yet it would seem evident that the list never con- 

 tained as many plants peculiar to our region as to the counties north and west of us, 

 and that there always have been more pure lake forms in the counties included in 

 the Northeastern Indiana Lake Region than in the remainder of northern Indiana. 

 From the frequent references which will occur to Lake County as the only other 

 station, or one of a few other stations, for a number of the plants peculiar to the 

 Northeastern Indiana lake region, it may be inferred that Lake County as a whole 

 is very similar to this region, and, with the intervening territory, should be in- 

 cluded. When the lists of this region and the lists of Lake County are compared 

 it will be found that there are many plants not in common. 



