206 



prairie and deciduous forest types of vegetation. There still re- 

 main, however, isolated spots, under peculiar local conditions, 

 in which the northern plants persist as relics. At Lake Matanzas 

 the bog is located in sogg^^ ground, fed by cold-springs at the 

 base of the bluff, bordering the lake on the eastward. Only a 

 part of the area is occupied by bog plants, at the present time, 

 and the evidence goes to show that swamp plants are gradually 

 displacing them. 



Fig. I. A portion of the Matanzas Bog, showing a stream course marked 

 by Leersia oryzoides, bounded by Saiirurus, back of which are shrubs (Cephalan- 

 thus) and trees {Beliila nigra). July 24, 1910. 



The ground at the foot of the bluff, kept relatively cold by 

 the water from the springs, is occupied by a luxuriant growth of 

 Berula erecta, a northern bog plant. The compound leaves of 

 the first-year plants form a dense mat over a strip about two 

 meters wide from which the flowering stalks of the second year 

 arise. Usually this growth occupies the entire space but not 

 infrequently, especially on the side away from the springs, there 



