CONTENTS. 



Introduction 1 



Plan of the work 3 



Collections studied 3 



Species included 4 



Ranges of the species 5 



Type localities 6 



Vernacular names 6 



Economic notes 8 



History of botanical exploration in Mexico 9 



Francisco Herndndez 10 



Expedition of Charles III 13 



Alexander von Humboldt 18 



Systematic treatment 19 



Key to the families 19 



Annotated catalogue 36 



List of additions and corrections 1643 



Index 1683 



