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WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 11 
1912, although some preliminary work had been done previously at 
the New Mexico Agricultural College. Descriptions of most of the 
new species discovered in the course of the work have been published 
in a recent part of the Contributions from the United States National 
Herbarium.’ Accounts of the Cactaceae and of the grasses and grass- 
like plants have appeared as bulletins of the New Mexico Agricultural 
Experiment Station.? 
It is our intention to publish in the near future, in the Contributions 
from the United States National Herbarium, an account of the phyto- 
geography of the State. This will include a discussion of the life zones 
and of the factors which influence them. There will also be a history 
of botanical exploration in New Mexico, and a discussion of other 
matters of botanical interest. 
Under each species in the present volume we have cited the place of 
publication, to facilitate reference to the original description. No 
attempt has been made to give complete synonymy, the intention 
being rather to enter only names having some more or less direct bear- 
ing upon New Mexican botany. In citing data regarding habitat and 
zonal distribution, only conditions inside the State have been con- 
sidered. In other States some of the plants often occur in habitats 
different from those we have indicated, although in all probability 
zonal distribution is practically constant for the same plant in what- 
ever region it may grow.’ The generic diagnoses have been drawn 
with only the New Mexican species in mind. 
In the preparation of the flora we have received the assistance of 
many persons, of whose aid we wish to express our appreciation. We 
are especially indebted to the following for help in various ways: 
Dr. E. L. Greene, Dr. N. L. Britton, Dr. P. A. Rydberg, Dr. B. L. 
Robinson, Prof. M. L. Fernald, Dr. J. H. Barnhart, Dr. Ezra Brainerd, 
Mr. George V. Nash, Dr. J. K. Small, Mr. K. K. Mackenzie, Prof. 
T. D.A.Cockerell, Mr. Vernon Bailey, Mr. E. A. Goldman, and Mr. C. R. 
Ball, as well as several of our botanical associates in Washington. 
Many residents of New Mexico have assisted by collecting specimens 
and furnishing data concerning the distribution and uses of plants. 
Our sincerest thanks are extended to numerous citizens of the State 
who have always afforded all the assistance in their power to collecting 
expeditions, which would have been impossible or unfruitful without 
their labors so freely expended in our behalf. 
1 Contr. U. 8S. Nat. Herb. 16: 109-196, 1913. 
2 Cacti in New Mexico. By E.O. Wooton. Bull. 78.1911. The grasses and grass- 
like plants of New Mexico. By E. O. Wooton and Paul C. Standley. Bull. 81. 1912. 
3 For an account of life zonesin New Mexicosee, Bailey, Vernon, Lifezones and crop 
zones of New Mexico. North American Fauna (U.S. Dept. Agr. Bur. Biol. Surv.) 
35. 1913. 
