CONTENTS 



CHAP. PAGE 



INTRODUCTION 221 



I. THE HISTORY OF TAXONOMIC PHYTOGEOGRAPHY AND ITS PRE- 

 SENT OBJECT AND PRINCIPLES 225 



II. SURVEY OF THE CONTINENTAL ELEMENT IN THE EUROPEAN 



FLORA 229 



Definition of the continental element 229 



The continental element in the flora on the Middle European plain 229 



Survey of the distribution of continental species in Europe 235 



III. THE ECOLOGY OF CONTINENTAL SPECIES AND PHYSIOGRAPHY 



OF CONTINENTAL REGIONS 243 



The climate and the ecology of continental species 244 



The nature of continental soil and the ecology of continental species ... 249 

 Continental geographical conditions and the general features in the distri- 

 bution of continental species in Europe 252 



IV. CONTINENTAL FEATURES IN THE PHYSIOGRAPHY OF SOUTH 



SWEDEN 255 



The degree of continentality of the South Swedish climate 255 



The nature of the soil in South Sweden 262 



V. THE HISTORY OF THE SOUTH SWEDISH FLORA 268 



VL SURVEY OF THE CONTINENTAL ELEMENT IN THE SOUTH SWE- 

 DISH FLORA 272 



VII. METHODS AND PRINCIPLES FOR THE ENQUIRY INTO THE DIS- 

 TRIBUTION OF CONTINENTAL SPECIES IN SOUTH SWEDEN 277 



VI 11. THE MODE OF OCCURRENCE OF STEPPE SPECIES IN SOUTH 



SWEDEN 281 



Halophytic steppe species 282 



Species of Stipa steppe, the sand steppe, and the meadow steppe 283 



Sarmatian psammophilous species 293 



IX. DISTRIBUTION OF STEPPE SPECIES AND SARMATIAN PSAMMO- 



PHILOUS SPECIES IN SOUTH SWEDEN 295 



The possibilities of occurrence of the species in South Sweden, if the 



vegetation were unaffected by human interference 295 



The distribution of the species and arable land in South Sweden 311 



The distribution boundaries of the species in South Sweden 318 



