562 HARPER: PINE-BARREN VEGETATION OF MISSISSIPPI 
The Ericaceae and allied families are usually pretty well repre- . 
sented in pine-barrens and other sandy regions, and therefore it 
is rather surprising that only one member of this family, Oxy- 
dendrum, was seen more than three times in all the travels above 
outlined. This may be correlated with the fact that the soils 
in southern Mississippi are a little richer than those of the average 
pine-barrens; but on the other hand, the Leguminosae, which 
seem to prefer soils pretty well supplied with potash, etc. but 
poor in humus, as in areas frequently burned over, seem equally 
_scarce here, only one species, Cracca Virginiana, being listed 
Flat damp pine-barrens, with trees mostly Pinus palustris, stunted and 
rather ditincedk about half a mile northof Fontainebleau, Jackson County. July 
£7, 2913. 
above. More extensive explorations are needed to solve the 
problem. 
Comparisons with other pine-barren regions.—It will be instruc- 
tive to compare the foregoing list of plants with quantitative 
lists previously published for the corresponding parts of Georgia* 
and Alabama.f In this way some conclusions can be drawn that 
would be upety impossible with qualitative lists of the usual 
* Plant World 15: 244. Oct. rgr2. 
t Geol. Surv. Ala. Monog. 8: 116-117. June 1913. (This includes trees only.) 
