TABLE OF CONTENTS 



Page 



INTRODUCTION 1 



TRAPACEAE 2 



Trapa 2 



Trapa natans 2 



Selected References 2 



HALORAGACEAE 5 



Myriophyllum 5 



Key to Species 5 



Myriophyllum tenellum 6 



Myriophyllum humile 6 



Myriophyllum farwellii 10 



Myriophyllum alterniflorum 10 



Myriophyllum pinnatum 10 



Myriophyllum verticillatum 10 



Myriophyllum heterophyllum 11 



Myriophyllum spicatum 11 



Myriophyllum exalbescens 12 



Proserpinaca 12 



Key to Species 12 



Proserpinaca palustris 19 



Proserpinaca pectinata 19 



Literature Cited and Selected References 19 



HIPPURIDACEAE 23 



Hippuris 23 



Hippuris vulgaris 23 



Selected References 24 



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