NOTES ON THE GEOGRAPHIC AND VERTICAL DISTRIBUTION OF CAC- 

 TUSES, YUCCAS, AND AGAVE, IN THE DESERTS AND DESERT RANGES 

 OF SOUTHERN CALIFORNIA, SOUTHERN NEVADA, NORTHWESTERN 

 ARIZONA, AND SOUTHWESTERN UTAH, 



By O. Hart Merriam, M. D. 



The following notes on the vertical and geographic distribution of 

 the desert cactuses, yuccas, and agave were made by me in April, 

 May, and June, 1891, along the route traversed from the north end of 

 Cajon Pass, in the San Bernardino Mountains, to the St. George Valley 

 at the foot of the Hurricane Cliffs, in southwestern Utah, and thence 

 westerly across ^Nevada to Owens Valley, California, and southward 

 and southwestward to the extreme end of the western tongue of the 

 Mohave Desert (Antelope Valley), including the several passes (Walker, 

 Tehachapi, and the Canada de las Uvas), by means of which communica- 

 tion is established between the Mohave Desert on the east and the 

 Bakersfield Plain or upper San Joaquin Valley on the west. A de- 

 tailed itinerary of this trip may be found in Part I of the present report. 



Nearly all of the species were photographed by me in the field, and 

 in most instances parts of the individual plant photographed were 

 brought back for positive identification. As in the case of the desert 

 shrubs, Mr. F. V. Coville is responsible for the nomenclature employed. 



LIST OF CACTUSES, YUCCAS, AND AGAVE. 



Cereus evgelmanni. 

 mohavensis. 

 Opuntia acanthocarpa. 



bernardina. 



echinocarpa. 



wMpplei. 



parryi. 



ramosissima. 



pulchella. 



basilaris. 



engelmanni occidentalis. 



rutila. 



EcMnocactus johnsoni. 



polycephalus. 

 * polyancistrus. 



wislizeni lecontei. 

 Mamillaria sp. 

 Yucca baccata. 



arborescens. 

 elata ? 

 macrocarpa. 

 whipplei. 

 Agave utahensis. 



845 



