Vlll PREFACE. 



in Idaho ; Upper Madison Canon, Lower, Biscuit, Upper and Lone 

 Star Geyser Basins, East DeLacy's Creek, Slioshone Lake, Yellow- 

 stone Lake near the Natural Bridge, Yellowstone Falls, Willow 

 Park, and Swan Lake, all in the Yellowstone Park; Electric Peak 

 on the boundary line ; and at Fridley, Emigrant Gulch, and Trail 

 Creek Pass in Montana. These collections contain over i,8oo num- 

 bers, representing about 800 species and over 20,000 specimens. 



In working up these collections it was found that the flora of the 

 state of Montana was very little known and still less understood. It 

 was therefore considered advisable to extend the work and study all 

 the material from the state that was accessible. This has had results 

 far beyond my expectations, for of the 1976 species and varieties 

 included in this catalogue, 776 are not contained in Coulter's Manual 

 of the Rocky Mountain Region, the only published flora including 

 the state of Montana, and 163 species and varieties are new to science. 



I wish to thank especially Mr. Frank Tweedy, of the United 

 States Geological Survey, for the loan of his private herbarium, so 

 rich in Montana and Yellowstone Park plants, and the Trustees of 

 the Montana College of Agriculture and Mechanical Arts, at Boze- 

 man, for the loan of the collections belonging to that institution. 

 These latter contained two collections made for the Columbian 

 World's Fair held in Chicago, one by the Rev. F. D. Kelsey and 

 Mr. R. S. Williams, and the other by several ladies, among them 

 Mrs. Moore, Mrs. Alderson, Mrs. Fitch, Miss Ware, Mrs. Muth, 

 Mrs. McNulty and Mrs. Hodgman. I also wish to thank the cura- 

 tors of the Gray Herbarium at Harvard University, of the Academy 

 of Sciences at Philadelphia, of the College of Pharmacy in New 

 York, and of the National Herbarium and of the Division of Agros- 

 tology at Washington, for specimens loaned, and for help in deter- 

 minations ; also the following persons : Dr. Thomas C. Porter, of 

 Easton, Penn. ; Mr. Peter Koch and Dr. Blankinship, of Bozeman, 

 Mont., and Professor Aven Nelson, of Laramie, Wyoming. The 

 grasses secured in the collections made for the Division of Agros- 

 tology were necessai^ily determined there ; those in the collections of 

 Mr. Flodman, and of Mr. Bessey and mj'self were determined by 

 Mr. George V. Nash. Nearly all the Carices have passed through 

 the hands of Professor L. H. Bailey. In Polygonaceae and Saxi- 

 fragaceae I have had help from Dr. J. K. Small ; and in the Um- 

 belliferae Dr. J. N. Rose has rendered valuable assistance. 



