PREFACE. 
In various preliminary papers, to which reference is made in the 
accompanying text, Mr. W. E. Safford, of the Bureau of Plant 
Industry, United States Department of Agriculture, has proposed 
several new sections of the genus Annona and has described many of 
the tropical American species. The present treatment is more com- 
prehensive, embracing a synoptical view of the genus by natural 
groups and sections, with descriptions of additional new or inade- 
quately known species. There are given, also, descriptions of two 
closely allied new genera, Fusaea and Geanthemum, and critical notes 
upon Rollinia, Duguetia, and Raimondia. This last genus, recently 
founded upon a single species, is found properly to include also a 
Colombian plant, described long ago by Humboldt, Bonpland, and 
Kunth as Anona quinduensis. 
Frepertck V. CoviLLe, 
Curator of the United States National Herbarium. 
III 
