Mat, 1893.] YUCCAS OF THE DEATH VALLEY EXPEDITION. 355 



north side of the desert to within a mile of Mohave Station, and ex- 

 tend thence westerly and southwesterly over Antelope Valley with 

 hardly a break between Mohave and Willow Spring, though they are 

 •xbsent from the dry flat extending from Willow Spring southerly and 

 westerly. On the south side of the desert they reappear on a low 

 ridge a few miles south of Mohave, and extend thence southerly past 

 Lancaster to and into Soledad Pass. In the extreme western end of 

 the Mohave Desert, known as Antelope Valley, they reach westward 

 along the middle and north part of the valley to a point about 6 kilo- 

 meters (4 miles) east of Liebre ranch, but on the south side (north 

 slope) they do not extend quite so far west. They reappear in an open 

 canon or broad wash leading south from near Gorman's ranch to Peru 

 Creek, where they occur in clumps and irregular patches for a mile or 

 so at an altitude of 850 to 900 meters (2,800-3,000 feet). 



Walker Pass. — At the east end of Walker Pass tree yuccas begin at 

 1,090 meters (3,600 feet) and form a fine forest in the pass, filling it all 

 the way across up to 1,430 meters (4,700 feet), and straggling on singly 

 and in little clumps up to and over the summit at 1,550 meters (5,100 

 feet) and down on the west side, with several interruptions, to the val- 

 ley of Kern Eiver. The total length of the yucca strip in the pass 

 proper is 18 or 20 kilometers (11 or 12 miles). From Walker Pass they 

 descend into Kern Valley, where a number of small interrupted groves 

 are scattered irregularly along the bottom of the valley nearly all the 

 way down to the forks of Kern River, at an altitude of 850 meters 

 (2,800 feet). 



Coso Mountains. — A yucca grove covers part of the west slope of the 

 Coso Mountains, beginning about 5 kilometers (3 miles) south of Owens 

 Lake and reaching thence southerly nearly to Haway Meadows. Its 

 lower edge comes down almost to the level of the valley (probably to 

 about 1,120 meters or 3,700 feet). A few scattering trees occur still 

 further south, but they are not numerous enough to form a grove. [Dr. 

 A. K. Fisher tells me that this grove spreads easterly over nearly the 

 whole of the Coso mountains and valley.] 



Panamint Mountains. — A few stunted tree yuccas occur on the west 

 side of the divide between Perognathus Flat and Wild Eose Spring in 

 the Panamint Mountains. 



Nelson Range— Kv. E. W. Nelson found tree yuccas in abundance on 

 the low range (here named ' Nelson Eange') separating Panamint Valley 

 from Saline Valley, where they stretch all the way across from the Inyo 

 Mountains to the Panamint Mountains. 



Ivaicatch Mountains. — Mr. T. S. Palmer found a few scattering trees 

 on the southwest slope of the Ivawatch Mountains. 



NEVADA. 



Mount Magnifier. — Tree yuccas occur sparingly on the north west slope 

 of Mount Magruderand adjacent hillsides from an altitude of 2,070 me- 

 ters (6,800 feet) down almost to the upper level of Fish Lake Valley at 



