CONTENTS. 



Page. 



The North American Species of Ichnanthus. By A. S. Hitchcock 1 



Introduction 1 



Description of the genus and species 1 



Doubtful or excluded species 12 



The North American Species of Lasiacis. By A. S. Hitchcock 13 



Introduction 13 



Description of the genus and species 13 



Doubtful species 31 



The North American Species of Bbachiaria. By Agnes Chase 33 



Introduction : 33 



History of the genus 33 



Description of the genus and species 35 



Excluded species 43 



The North American Species of Cenchrus. By Agnes Chase 45 



Introduction 45 



Terminology 46 



History of the genus 47 



Description of the genus and species 50 



Doubtful species 76 



Excluded species 77 



Index ix 



v 



