2 
PLANTS OF YELLOWSTONE NATIONAL PARK 
is often known by entirely different names in different localities, or 
the same name may be applied to wholly unrelated plants in different 
parts of the country. For this reason, it is necessary to use scientific 
names in addition to the common names in order to make clear the 
plants with which we are dealing. 
Except where authorities in special fields have been consulted, the 
scientific nomenclature follows for the most part the a New Manual 
of Rocky Mountain Botany 55 by Coulter and Nelson. For the plants 
not included in this manual, with the exception of the grasses and 
trees, we have followed the nomenclature of Rydberg’s “ Flora of 
the Rocky Mountains and Adjacent Plains.” For the grasses Hitch¬ 
cock’s “ Manual of the Grasses of the United States ” has been con¬ 
sulted, and for the trees Sudworth’s “ Check List of the Forest Trees 
of the United States, Their Names and Ranges.” 
We have omitted the authorities for the scientific names, because 
we believe they would be confusing rather than helpful to the great 
majority of those who will use the book and of little value to anyone 
unless verified by more intensive research. 
We have endeavored to include all plants that seem to have been 
authentically reported as occurring in the park, but those that are 
somewhat doubtful are merely listed without descriptions. 
We hereby solicit corrections and criticisms from users of the 
book, for the improvement of any future editions must depend 
largely upon such help. 
It would be impossible to mention everyone who has contributed 
to the preparation of this publication. The authors feel especially 
indebted to Dr. Henry S. Conard, without whose preliminary work 
on the flora of the park this book would scarcely have been possible, 
and to Dr. Aven Nelson, Dr. Frederick Y. Coville, Dr. A. S. Hitch¬ 
cock, Mrs. Agnes Chase, Dr. S. F. Blake, and Dr. William R. Maxon 
for many identifications, verifications of identifications, and helpful 
suggestions. They are also deeply grateful to Dr. H. C. Bryant 
for his interest and encouragement and to other members of the 
personnel of the National Park Service and of Yellowstone Park 
in particular who have contributed in any manner. The line draw¬ 
ings have been made by Mrs. Marguerite L. Arnold, and the cover 
design by R. J. Cheesman, to whom the authors are under deep 
obligation. All contributions of photographs are acknowledged in 
the legends of the figures. To each and everyone who has aided 
in any way, directly or indirectly, in the preparation or publication 
of the book sincere appreciation is hereby expressed. If the work, 
in any measure, serves to aid park visitors in enjoying the natural 
beauty of Yellowstone National Park the purpose of the authors will 
have been accomplished. 
