WOOTON AND STANDLEY — FLORA OF NEW MEXICO. 11 



1912, although some prehminary 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. 1 Accounts of the Cactaceae and of the grasses and grass- 

 like plants have appeared as bulletins of the New Mexico Agricultural 

 Experiment Station. 2 



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. 3 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. Kydberg, 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 La our behalf. 



1 Contr. U. S. Nat. Herb. 16: 109-196. 1913. 



2 ( Sacti in New Mexico. By E. O. Wooton. Bull. 78. 1911. The grasses and grass- 

 like plants of New Mexico. By E. 0. Wooton and Paul C. Standley. Bull. 81. L912. 



3 For an account of life zones ill New Mexico sec, Bailey, Vernon. Life zones and crop 

 zones of New Mexico. North American Fauna (U. S. Dent. Agr. Bur. Biol. Surv.) 

 35. L913. 



