U. S. GEOGRAPHICAL SURVEYS WEST OF THE ONE HUNDREDTH MERIDIAN, FIRST 
IEUT. GEO. M. WHEELER, CORPS OF ENGINEERS, U. 8. ARMY, IN CHARGE. 
BRBEPOQETS 
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. 
BY 
J. T. ROTHROCK, 
LATE A. A. SURGEON, U. S. ARMY, 
SURGEON copes BOTANIST TO THE EXPEDITIONS OF 1873, 1874, AND 1875, AND NOW rimgeeeny 
BOTANY IN THE UNIVERSITY OF PENNSYLVANIA, PHILADELPHIA, P 
AND THE FOLLOWING SCIENTISTS: 
SERENO WATSON, Campripcr, Mass. GEORGE VASEY, M. D., AGRICULTURAL DEPARTMENT, 
GEORGE ENGELMANN, M. D., Sr. Lous, Mo. WasurincTon, D. C. 
Pror. THOS. C. PORTER, FEASTON, PENN. Pror. D. C. EATON, Yate COLLEGE, NEW HAVEN, Conn. 
M. S. BEBB, FouNTAINDALE, ILL. THOS. P. JAMES. CAMBRIDGE, MAss. 
WILLIAM BOOTT, Boston, Mass. Pror. EDWARD TUCKERMAN, AMnHerstT, MAss. 
IN FOUR CHAPTERS AND AN APPENDIX. 
ILLUSTRATED BY THIRTY PLATES AND ONE WOODCUT. 
Vil 
