CONTENTS. 



Page. 



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 S 



History of botanical exploration in Mexico 9 



Francisco Hernandez: 1.0 



Expedition of Charles III- 13 



Alexander von Humboldt 18 



Systematic treatment 19 



Key to the families 19 



Annotated catalogue 36 



Index vii 



V 



