HARPER 



PAGE 



Topography and drainage 23-28 



Ridges, ponds, branches, swamps, sand-hills, hammocks 23-26 



Rate of erosion 27 



Classification of streams according to origin 27 



Climate 28-30 



Average temperature and total rainfall 29 



Vegetation. 



General considerations 30 



Causes of local diversity 31 



Environment, history, and adaptations 



Classification according to habitat 33 



Analogies between habitat-groups and taxonomic groups. ... S3 



Method of treatment 34 



The habitat-groups in detail. 



1 . Rock outcrops 41 



2. Dry pine-barrens 44 



3. Intermediate pine-barrens 50 



4. Moist pine-barrens 54 



5. Branch-swamps 62 



6. Creek-swamps 66 



7. Swamps of rivers of the second class 69 



8 . Muddy river-swamps 71 



Remarks on the eight preceding groups 74 



9. Cypress ponds 75 



10. Shallower pine-barren ponds 79 



1 1 . Deeper ponds along the escarpment 81 



1 2 . Sand-hills 82 



13. Intermediate sand-hills 89 



14. Sand-hill bogs 90 



15. Non-alluvial swamps 93 



16. Sand-hill ponds 95 



17. Sand-hammocks 97 



18. Hammocks 98 



19. River-bluffs 102 



Statistical summary of the foregoing habitat -groups 106 



Relation of the typical habitat-groups to each other 108 



Exceptional and little-known habitats no 



Weeds < 114 



Effects of civilization 117 



Cultivation, lumbering, turpentining, grazing, fire, destruction 

 and modification of fauna, artesian wells, muddy streams. 



Remarkable stability of the flora no 



