12 
^orth Carolina Experiment Station 
Associations. In addition to the two communities of the dominants, 
the following should be mentioned: 
Chamcecy paris thyoides Persea borbonia 
Nyssa biflora Arundinaria arundinaria 
Acer rubrum Tillandsia usnoides 
Successional Relations. Accompanying the slow aggradational 
changes, this formation gradually gives way to the Quercus-Pinus asso¬ 
ciation of the mesophytic forest. Extensive areas of this formation 
occur which are maintained for long periods of time so that this com¬ 
munity may be regarded as an edaphic sub-climax formation. 
IMIi.s «■ s®"- yd 
bvWntfin 
■w> Wj 
flLwVBii - 
mmMmm 
Fig. 6. Nyssa Association 
8. Quercus-Aristida (Quercus catesbcei, Aristida stricta). Sand 
Ridge community. 
Distribution. Locally in Coastal Plain south of the Hatter as axis. 
Habitat. Well drained, humus-darkened, coarse, sandy soil, the sur¬ 
face one-half inch of which through the washing action of the rain, is 
humus-free, forming a glistening white layer. The surface of the sand 
ridges is thus as white as snow and the intense reflection of the mid¬ 
summer heat and light constitutes the critical factor in the determina¬ 
tion of the vegetation occupying the area. 
