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PREFACE TO THE FIRST EDITION After more than twenty-five years of study of the flora of the Rocky Mountain region, and seventeen years after the first description was drawn for the book, this manual is now presented to the public. Its history, purpose and scope are given in the introduction, with certain necessary explanations regarding the general features of the book. Thanks are due to the custodians of many herbaria for the privilege of studying collections and types, and for the loan of specimens; these herbaria are enumerated in my introduction. The author wishes to thank all his associates at the New York Botanical Garden, especially Dr. N. L. Brit-ton, Director-in-Chief, for encouragement and help in his work; Dr. J. K. Small, for help in critical cases and in certain groups, as for instance POLYUOANCEAE and SAXIFRAGACEAE, and in the original draft of the key to the families; and Dr. J. H. Barnhart, for help in questions of nomenclature and literature. In drawing the generic descriptions, the author has frequently consulted Dr. Small's FLORA OF THE SOUTHEASTERN UNITED STATES. Dr. Barnhart has contributed also the list of authors, including their full names and years of births and deaths wherever it has been possible. Thanks are also due to Mr. K. K. Mackenzie, who contributed the manuscript of Carex; to Professor E. Brainerd, who prepared that of Viola] and to Mr. W. W. Eggleston, who revised that of Crataeyus. As most manuals of phaenerogamic botany also contain the ferns and their allies, an account of the fern-worts by Miss Margaret Slosson has been appended. The families ISOETACEAE, EQULSETACEAE and SELAGINELLACEAE were left by her until the last. She did some preliminary work on SelagineMa, but before the work was finished she left the New York Botanical Garden temporarily, and the completion of the fernworts fell upon the author, who feels that the treatment of the three families is not adequate, as the manuscript \\ as prepared hurriedly while the book \vas going through the press. The author is indebted especially to the following botanists, who have kindly corrected the statements of the ranges of all the species and furnished additions to the list of species known to occur in their respective states and provinces: Mr. J. M. Macoun-, western Canadian provinces; Professor J. E. Kirkwood, Montana; Mr. J. Francis Macbride, Idaho; Professor A. 0, Garrett, Utah; and Mr. George E. Osterhout, Colorado. Thanks are also duo to the following persons who have gratuitously helped in reading the proofs: Professor A. 0. Garrett, Mr. G. E. Osterhout, Miss K. D. Kimball. P. A. RYDBERG. The New York Botanical Garden, November, 1917. PREFACE TO THE SECOND EDITION The bound copies of the first edition of this Manual \\ere all sold some months ago. During the five years gone by, since the first appearance of the book, a number of new species have been aescribed from the region, and specimens of additional species, introduced from the Eastern United States, from the Pacific Slope, or even from the Old World, have been collected. Thus have been added to the Flora of the Rocky Mountain Region: 2 families, 17 genera, and 132 species. The Flora of flowering plants and ferns contains, therefore, as far as known now, 1055 genera and 6029 species. The known ranges of many species have also been extended. In order to carry the work up to date, it was thought best to add to the new issue an appendix of Additions and Corrections and Extension of Ranges. In preparing this appendix, I have received help from the following persons, to whom my thanks are due: Mr. W. A. Dayton and Mr. I. Tidestrom of U. S. Forest Service, Mr. G. E. Osterhout, Prof. E. Bethel and Miss Hazel M. Schmoll, of Colorado, Prof. A. 0. Garrett of Utah, and Prof. E. B. Payson of Wyoming. P. A. RYDBERG. The New York Botanical Garden, November, 1922. Table of Contents INTRODUCTION TABLES: Abbreviations, Signs and Measurements DESCRIPTIVE FLORA SPERMATOPHYTA: KEY TO THE FAMILIES GYMNOSPERMAE ANGIOSPERMAE : Monocotyledones Dicotyledones PTERIDOPHYTA APPENDIX SUMMARY NEW GENERA AN SPECIES AND NEW COMBINATIONS ABBREVIATIONS of THE NAMES Of AUTHORS GLOSSARY INDEX SECOND APPENDIX ADDITIONS AND CORRECTIONS EXTENSIONS OF RANGES NEW SPECIES AND NEW COMBINATIONS PUBLISHED IN THE SECOND EDITION INDEX TO THE ADDITIONS End of Preview.
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