CONTENTS. 



Page. 



The North American Species op Isachne 115 



Introduction 115 



Description of the genus and species 115 



The North American Species of Oplismenus 123 



Introduction : 123 



Description of the genus and species 123 



Doubtful species 132 



The North American Species of Echinochloa 133 



Introduction 133 



Description of the genus and species 133 



Doubtful species 153 



The North American Species of Chaetochloa 155 



Introduction 155 



Description of the genus and species 156 



Doubtful species 208 



Index ix 



v 



