CONTENTS 



PAGE 



Entomophilous Flowers 516 



Dichogamy 616 



Odors of Flowers 619 



Nocturnal Flowers 619 



Prevention against Self-pollination 520 



Sensitive Organs 522 



Ornithophily 524 



Heterostylisra 525 



Autogamy . 525 



Protection of Pollen against Moisture 524 



Protection against Animals 526 



Myrmecophilism 527 



Bibliography 628 



CHAPTER XV 

 GEOLOGICAL AND GEOGRAPHICAL DISTRIBUTION 



Fossil Plants 530 



Thallophytes 630 



Bryophytes 531 



Pteridophytes 531 



Gymnosperms 535 



Monocotyledons 536 



Dicotyledons 536 



Factors influencing the Distribution of Living Plants 536 



Climate 537 



Isolated Floras 541 



Alpine Floras 542 



Similarity in Remote Regions . . 542 



Flora of the United States 544 



The Eastern Forest 544 



Prairies 545 



Deserts 546 



Flora of the Pacific Coast . 647 



Bibliography 650 



