Jennings: Contribution to Botany of Isle of Pines. 21 



those originally indicated on the labels. As these specimens supple- 

 ment those collected by the writer, it has been thought advisable to 

 include in this list a reference to them also. 



To facilitate further work upon the flora of this interesting island 

 analytical keys for the species of the various families have been 

 incorporated. These keys have been mainly based on the more 

 readily observable characters of leaves and flowers. In some of the 

 more difficult families the writer has taken the liberty of remodelling 

 certain keys published by other authors, to whom he renders thanks 

 and makes apology, if apology be necessary. 



The sequence followed in this list is essentially that of Engler's 

 Syllabus der Pflanzenfamilien and the nomenclature is based upon the 

 International Rules of Botanical Nomenclature, excepting as to the 

 "Nomina Conservanda" in matters of priority. 



Great care has been exercised in the preparation of the synonymy. 

 When synonyms are very numerous a selection has been made, 

 preference being given to those based upon West Indian material, 

 or most likely to be accessible to American botanists working upon 

 West Indian plants. 



Before closing these brief preliminary remarks I wish to express 

 my sense of indebtedness to Dr. C. F. Millspaugh for his kindness 

 in identifying certain of the Euphorbiacece. I wish also to put upon 

 record my appreciation of the services rendered me by my travelling 

 companions during the expedition of 1910, and of the courtesy and 

 hospitality shown us on that occasion by Colonel Thomas J. Keenan, 

 a citizen of Pittsburgh, who has done much to promote the industrial 

 development of the Isle of Pines. To Dr. Jared F. Shafer the Car- 

 negie Museum is indebted for the specimens collected by him, and 

 the writer, in particular, wishes to acknowledge the assistance re- 

 ceived from him in the study of the orchids, some of which he has 

 successfully propagated and brought to flower in his conservatory, 

 where it has been possible to view them from time to time and to 

 obtain additional specimens. To Mrs. O. E. Jennings, for assistance 

 in consulting the literature and in preparing photographs, and to 

 Mr. Sidney Prentice, for his careful drawings of the plates, my thanks 

 are due. I wish gratefully to acknowledge the support and encourage- 

 ment given me by Dr. W. J. Holland, the Director of the Carnegie 

 Museum, which made possible the collection of the specimens and the 

 preparation of the present report. I am indebted to him for his 



