210 



ganium eiirycarpum, Amsonia tahernaemontana, and Impatiens 

 fiilva, meadow and thicket plants as Onoclea sensihilis and Steiro- 

 nema ciliatum and mesophytic woodland plants as Tecoma radi- 

 cans, Laportea canadensis and Ranunculus ahortivus. Some of 

 these plants, as Spathyem.a, occur here near their southern limits, 

 while others, as Amsonia and Tecoma, are at their northern limits. 



Fig. 3. A general view of the Matanzas Bog from the bluff, showing the 

 succession from the Berula in the foreground, through the shrubs to the trees. 

 July 24, 1910. 



Doubtless many other interesting points could be brought out 

 during the spring and fall but the region was investigated only 

 in midsummer. 



The presence of Spathyema and Berula is especially interesting 

 because it is an occurrence of northern plants far south of their 

 normal southern limits of their characteristic associations. They 

 serve as indices to show the character of the former vegetation of 

 central Illinois. That one should find these northern plants 



