r 



CONTENTS. 



Page. 

 List of plates VIII 



Prefatory note ^ 



Itinerary . _ ■> 



Principles of plant distribution 10 



Definition of terms. 



10 



Problem of distribution ij 



Conditions that affect distribution 12 



Comparative values of plants in determining fboal zones 16 



Distribution of plants in southeastern California 19 



Classification of floras *« 



Geographic relationship of the flora of the high Sierra Nevada, California.. 26 



Geographic relationship of the flora of Death Valley 31 



Characteristics and adaptations of the desert flora 33 



Source and distribution of moisture 33 



Conservation of moisture 35 



Temperature 07 



Seasons go 



Classified list of desert plants %g 



General adaptations 42 



Special adaptations ** 



Catalogue of species. ee 



Summary of catalogue.. 



1':;;: 



Catalogue of specimens 233 



Bibliography ggj 



Index 



301 



Explanations of plates ooq 



Index to map o^. 



VII 



