XVlll 



CONTENTS 



INTRODUCTION 



First Section 



PAGE 



Historical Development of Flower Pollination i 



Second Section 

 Present Standpoint of Flower Pollination 28 



I. Survey of the Modes of Pollination and of the Distribution of 



THE Sexes ........... 28 



II. Autogamy -34 



Self-sterile Plants . . -36 



Self- fertile Plants 38 



III, Geitonogamy .41 



IV. Xenogamy 42 



V. Heterostyly -44 



VI. Cleistogamy 51 



VII. Parthenogenesis 60 



VIII. Flower-groups . . . .62 



I. Water-pollinated Plants, Hydrophilae 68 



II. Wind-pollinated Plants, Anemophilae 69 



III. Animal-pollinated Plants, Zoidiophilae 72 



{a) Plants with Bat-pollinated Flowers, Chiropterophilae . .72 

 (3) Plants with Bird-pollinated Flowers, Ornithophilae . . 73 

 {c) Plants with Snail-pollinated or Slug-pollinated Flowers, 



Malacophilae . . . . 1^ 



{d) Plants with Insect-pollinated Flowers, Entomophilae . . 80 



Protective Arrangements for Pollen . . . . .80 



Conspicuousness ...... 83 



Odour . 88 



