CONTENTS 



Page. 



Introduction 5 



Chapter 1. Enumeration of the Alpine species of vascular plants observed by the writer in the Rocky Moun- 

 tains of Colorado 7 



2. The geographical distribution of the Alpine species 13 



3. The history of the Alpine flora 16 



4. Notes on the probable location of centers of distribution and development of the Alpine species. . . 18 



5. Descriptions of Alpine types 37 



6. Concluding remarks 43 



3 



