CONTENTS. 



Page. 



Introduction 261 



Climate 262 



Temperature - 262 



Sunshine - - 264 



Atmospheric humidity.... 264 



Precipitation _ 265 



Wind - 266 



Physiography 266 



Geology and soils. 267 



The plant formations, their composition and physiognoijiy 260 



Sand-strand vegetation 270 



Treeless, open formations 270 



Beach formation 270 



Dune formation 270 



Evergreen tree and shrub formations 271 



Tree formation : 271 



Thicket formation 272 



Salt-marsh vegetation _ _ , 272 



Creek- marsh formation 272 



Spartiua stricia association 272 



Jiincus roemerianus association 273 



Dune-marsh formation 274 



Tidal flat formation 274 



Pasture and ruderal plants _. 275 



Cultivated plants 275 



Ecological forms and adaptations to environment . . 275 



Adaptations to the mechanical action of the wind and the instability of 



the soil ^ 276 



Adaptations for protecting the supply of water 277 



Anatomy . 280 



Species of the sand strand 285 



Panicum amarutn 285 



Mnhlenbergia filipes 285 



Spartina patens 288 



Spartina stricta. . 289 



Chloris petraea 290 



Uniola paniculata 292 



Yucca aloif olia 298 



Yucca gloriosa. '. 293 



Myrica carolinensis 294 



Myrica cerif era 294 



Quercus virgini ana ... 294 



Zanthoxylnni clava-herculis 295 



Croton maritimus _ - 296 



III 



