ALTAMAHA GRIT REGION OF GEORGIA 



63 



their shade in preference to the bright sunlight of the open pine- 

 barrens. Here we doubtless have an example of that succession 

 of vegetation which has been so ably worked out by Dr. Cowles 

 in the vicinity of Chicago and elsewhere. 



All branch-swamps are not alike ; some contain a great many 

 more bushes than others. The densest of these swamps seem to 

 be where the Columbia sand is deepest, probably because where 

 it is thin the water runs off the adjacent slopes faster and does 

 not favor the accumulation of humus. Illustrations of the open 

 and dense types are subjoined (Plate IV, Fig. 2, and plate V). 



As there are all possible gradations between open and dense 

 branch-swamps, they are all combined in the following list 

 of characteristic species. 



3 Pinus Elliottii 



2 



— 



11 Nyssa biflora 







2 Taxodium imbricarium 



2-3 



— 



9 Magnolia glauca 



4-7 



white 



7 Pinus serotina 



3-4 



— 



5 Liriodendron Tulipifera 



4 



cream 



5 Acer rubrum 



2 



red 



1 Persea pubescens 







1 Gordonia Lasianthus 



7-9 



white 



11 Pinckneya pubens 



6-7 



pink 



10 Viburnum nudum 





white 



7 Nyssa Ogeche 



4-5 





5 Clethra alnifolia 



7-8 



white 



5 Cyrilla racemiflora 



6-7 



white 



5 Rhus Vernix 





cream 



4 Pieris nitida 



3-4 



white 



3 Cliftonia monophylla 



3-4 



white 



1 Hypericum fasciculatum 



4-8 



yellow 



2 Aronia arbutifolia 



3-4 



white 



2 Ilex glabra 



4-5 



white 



2 Viburnum nitidum 



4 



white 



2 Leucothoe racemosa 



4 



white 



1 Ilex myrtifolia 







1 Smilax la un folia 





cream 



1 (Phoradendron flavescens) 





green 



1 Alnus rugosa 



1-2 



— 



1 Wistaria frutescens 



4 



blue 



1 Rhus radicans 



5 



cream 



4 Sabbatia foliosa ^ 



6-8 



purple 



