CONTENTS 



PAGE 



Introduction 1 



Flora and Vegetation 3 



Description of the Arer. 3 



Vegetational Divisions 4 



Systematic Treatment 8 



Key to the Sections 8 



Key to the Families 9 



Keys to the Genera and Species 40 



Glossary 356 



Conspectus of Classification 369 



Index of Plant Names 374 



FIGURES 



Vegetational Map of Illinois vi 



County Map of Illinois 355 



[Uj ( L I : ^ ARY 





