U. S. GEOGRAPHICAL SURVEYS WEST OF THE ONE HUNDREDTH MERIDIAN, FIRST 

 LIEUT. GEO. M. WHEELER, CORPS OF ENGINEERS, U. S. ARMY, IN CHARGE. 



REPORTS 



UPON 



THE BOTANICAL COLLECTIONS MADE IN PORTIONS OF NEVADA, UTAH, 

 CALIFORNIA, COLORADO, NEW MEXICO, AND ARIZONA, 



DURING 



THE YEARS 1871, 1872, 1873, 1874, AND 1875. 



J. T. ROTHROCK, 



LATE A. A. SURGEON, XT. S. ARMY, 



SURGEON AND BOTANIST TO THE EXPEDITIONS OF 1873, 1874, AND 1875, AND NOW PROFESSOR 

 OF EOTANT IN THE UNIVERSITY OF PENNSYLVANIA, PHILADELPHIA, PA. ; 



AND THE FOLLOWING SCIENTISTS : 



SERENO WATSON. Cambbtdgk, Mass. 

 GEORGE EXGELMANX, M. D., St. Louis, Mo. 

 l'nop. THOS. C. PORTER, Easton, Pens. 

 M. S. 15EBIS, FountSundale, III 

 WILLIAM BOOTT, Boston, Mass. 



GEORGE VASEY, M. D., Agricultural Department, 



Washington, D. C. 

 Prof. D. C. EATON. Yale College, New Haven, Conn. 

 TIKiS. P. .TAMES. Cambridge, Mass. 

 Pkof. EDWARD TUCKERMAN, Amherst, Mass. 



IN FOUR CHAPTERS AND AN APPENDIX. 



ILLUSTRATED BY THIRTY PLATES AND ONE WOODCUT. 



