414 



The Ohio Naturalist. 



[Vol. XV, No. 3, 



Other Plants Apparently Confined to the Area and of 

 Rarer Distribution. 



Selanginella rupestris. 

 Manfreda virginica. 

 Magnolia tripetala. 

 Viola hirsutula. 

 Viola pedata. 

 Silene rotundifolia. 

 SuUivantia suUivantii. 

 Quercus marilandica. , 



Quercus triloba. 

 Azalea lutea. 

 Rhododendron maximum. 

 Epigaea repens. Its southern ex- 

 tension in Ohio. 



Gaultheria procumbens. Its south- 

 em extension in the State. 

 Chionanthus virginica. 

 Anisostichus capreolata. 

 Lobelia puberula. 

 Coreopsis major. 

 Chrysopsis mariana. 

 lonactis linariifolius. 

 Eupatorium rotundifolium. 

 Eupatorium aromaticum. 



IV. The Miami Area is a glaciated area mainly calcareous. It is 

 drained by the big and little Miami rivers and small tributaries of 

 the Scioto and Ohio. The Ohio-Erie divide may be taken as its 

 northern boundary. Juniperus virginiana is its only conifer with 

 the exception of a few isolated records of hemlock, except in the 

 eastern part where Thuja occidentalis occurs in isolated groups, 

 from Franklin county southward to Adams county. The arbor- 

 vitae is not known to be native of any other part of the state. 

 Juniperus virginiana, which is the only conifer of general dis- 

 tribution in the central deciduous forest region and the prairie of 

 the Um'ted States, is rather common especially toward the south- 

 west. A number of southwestern plants occuriing in this area 

 are listed below. 



V. The Great Black Swamp Area is a great level tract, in- 

 cluding most of northwestern Ohio except the extreme corner. 

 It is drained mainly by the Maumee and Sandusky Rivers. 

 The typical black swamp is characterized by the entire absence 

 of conifers except Larix laricina which occurs on its margins. 

 Originally there were a number of edaphic prairies in this region 

 like the "Big Spring Prairie" in Hancock, Seneca and Wyandot 

 counties. 



VI. The Williams County Area may be bounded in Ohio by 

 the ancient Lake Erie beach, extending in a southwesterly direc- 

 tion. It includes also a small part of Fulton and Defiance coun- 

 ties. The surface is generally rolling with marshes and water- 

 basins, often without natural drainage, presenting the usual fea- 

 tures of moraine districts. There are a number of tamarack 

 bogs with the accompanying vegetation. This characteristic 

 area extends westward into Indiana and northward into Michigan 

 and is probably the southern part of the Ann Arbor flora quite 

 distinct from the contiguous Maumee flora. 



VII. The Sandusky Bay and Lake Erie Islands Area is a 

 distinctive region where eastern, western, and northern plants 

 meet. In many respects it is an island where isolated species of 



