All suck plants are included in this book as have been observed by the writer 
as trees, even if usually occurring as shrubs. To the many species of trees already 
known the writer has added 1 new genus, 22 new species, 31 new varieties, 3 new 
forms and 1 new hybrid, which are all described by him. A number of new 
Species were discovered by the writer, but described by various authorities, in- 
cluding 4 new species of Palms by O. Beceari of Florence, Italy, all of which 
are included in this book. In an addendum the writer describes seven new 
species, seven new varieties and one new form belonging to the Family Cam- 
panulaceae, tribe Lobelioideae. This brings the total number cf new plants 
described by him herein up to seventy-two. 
It was also necessary in some instances to make a few new combinations. 
Of the 215 photographs nearly all were taken by the writer in the field, with 
the exception of plates 1, 12, 17, 27, 68, 130, and 131, by Mr. R. S. Hosmer; nos. 
29 and 37 by Mr. R. Perkins; no. 2, by Mr. A. Gartley, and nos, 23, 26 and 31, by 
Mr. R. J. Baker, to all of whom the writer wishes to acknowledge his indebtedness. 
The present volume is primarily due to the enthusiasm of Ex-Governor George 
R. Carter, who headed the list of patrons and secured the necessary funds to 
insure publication. Credit is due the College of Hawaii for supplying photo- 
graphic material and part of the writer’s time. 
It should be stated here that most of the material on which this publication 
is based was collected by the writer under the auspices of the Board of Commis- 
sioners of Agriculture and Forestry of this Territory. 
To Dr. H. L. Lyon the writer is indebted for technical advice, and to Dr. E. 
Hackel and Rev. George Kiikenthal for identification of Grasses and Cyperaceae 
respectively. 
To Mr. Francis Gay of Kauai the writer is greatly indebted for knowledge of 
matters pertaining to Hawaiian names of trees and their uses ; he also wishes to 
express his thanks to all those who extended to him the far-famed Hawaiian 
hospitality during his many sojourns on the various islands of the group. 
Last but not least the writer wishes to acknowledge the kind assistance 0° 
Prof. H. M. Ballou of the College of Hawaii in his painstaking reading of proof- 
sheets, and expresses his thanks to him and all those who have helped in the 
preparation of this book. 
The volume is herewith presented to the public, who the writer hopes will be 
lenient towards any mistakes in the construction of sentences, English not being 
his mother-tongue. 
JosepH F. Rock. 
College of Hawaii, 
Honolulu, T. H., April 23, 1913. 
