PREFACE 
In making this list the aim has been to include all conifers and 
flowering plants, both native and introduced, which grow without culti- 
vation in Nebraska. The known range of each species in the state is 
given, followed by a list of the localities from which it has been 
reported. These localities are mostly based on specimens in the 
herbarium of the University of Nebraska. 
The arrangement of the larger groups is ‘that of Di, C. E. Bessey 
in his Synopsis of Plant Phyla. Within the families the order is 
usually that of Britton’s Manual. 
As this list contains no descriptions it should be used in connection 
with a descriptive manual. For this purpose Britton’s Manual of the 
Flora of the Northern States and Canada is recommended as it is the 
only one covering the entire state. It is published by Henry Holt and 
Company, New York. 
Each group is preceded by analytical keys and at the beginning 
of the book keys to the orders will be found. The aim has been to 
make these as simple and non-technical as possible. As the number 
of plants treated is much smaller than in the larger manuals the keys 
should be much easier to use. In order to make it easy to find the 
descriptions, after the name has been found by the keys, the page in 
Britton’s Manual where the genus is treated is given after the name 
of each genus, thus Bromus 148. 
Names of orders end in -ALES and of families in -ACEAE and may 
thus be recognized “without repeating order or family before each. 
Synonyms are givén where a different name is used than the one in 
Britton’s Manual or when a different name is used in the New Gray’s 
Manual, 
In the appendix some of the structures most commonly used to 
distinguish flowering plants from each others will be described. It is 
hoped that this will be more useful for beginners than a glossary of 
special terms. 
I wish to express my thanks to Dr. C. HE. Bessey for advice and 
assistance while doing the work; to Rev. J. M. Bates and Dr. H. Hape- 
man for allowing me to examine their collections of Nebraska plants; 
to Dr. P, A. Rydberg for looking over part of the manuscript and mak- 
ing valuable suggestions; to Miss Venus Pool for suggestions in mak- 
ing the keys to the grasses. 
N, F. PETERSEN. 
Louisiana State University, 
September, 1911. 
