THE FLORA OF MISSISSIPPI. 161 



Euonymus Americanus, Symplocos tinctorta, 

 Pedicularis Canadensis, Vicia micrantha, 



Podophyllum peltatum, Sisyrinchium album, 



Uvularia perjoliata, Polymnia Uvedalia, 



Aesculus pavia, Phegopteris hexagonoptera, 



Arisaema Draconttum, Polygonatum giganteum, 



Smilacina racemosa, Thaspium aureum, 



Trillium sessile, Commelyna hirtella, 



Hydrolea affinis, Herpestis rotundifoUa, 



Asclepias perennis, Coreopsis trichosperma. 



Longleaf Pine Region. — This region constitutes the 

 whole southern half of the State south of the Jackson prai- 

 ries. In fact, the floral characteristics of this region are 

 noticed in the eastern part of the State as far north as 

 Meridian, thus lapping over that end of the Jackson prairie 

 region as shown on the map. This is due to the fact that, 

 while limited areas of the prairie soil with its flora are to 

 be found in the eastern part of the State, they are com- 

 pletely surrounded by the red sandy formations that fur- 

 nish the soil of the southern pine region flora, and hence 

 that flora has followed the soil northward. 



The soil of this region, as just stated, is a reddish brown 

 sandy loam, and is on the whole a more sterile soil than 

 any of those already discussed. It is generally poor in 

 all the elements of plant food, and when high above drain- 

 age is a dry soil. In the low flat coastal belt, however, 

 the surface lies so low that over the whole region consid- 

 erable areas lie at about the level of ground water, and are 

 permanently wet and sobby. The water-logged condition 

 induces an acidity of the soil, so that altogether the con- 

 dition of a northern bog is simulated, with the result that 

 these places support a flora very suggestive of bog flora. 



This region might be conveniently described under 

 two floral facies, that of the low, wet coastal flats, and 

 that of the upland pine region proix^r. These distinctions 

 will only be hinted at in this paper, though the floral dif- 

 ferences between, for example, Lincoln and Harrison coun- 

 ties are so striking as to be at once noticed. 



