May, 1893.] SHRUBS OF THE DEATH VALLEY EXPEDITION. 6x1 



(5,000 feet). On the east side it is common in a wash leading down 

 from Paliroc Plain through the Hyko Mountains. 

 Virgin Valley. — Common in places. 



UTAH. 



Beaver dam Mountains. — Peaches up the west slope of the Beaverdam 

 Mountains to 1,340 meters (4,400 feet). 



Santa Clara Valley. — Common over most of the valley, reaching up on 

 the east slope of the Beaverdam Mountains to 1,100 meters (3,000 feet). 



Franseria dumosa. 



This small and inconspicuous shrub is one of the most important 

 zone plants of the Lower Sonoran Zone, because of its wide distribu- 

 tion and strict adherence to the lower division of this zone. It occurs 

 almost invariably in company with Larrea tridentata. The following 

 notes on its distribution were recorded: 



CALIFORNIA. 



Mohave Desert. — Abundant, finding its upper limit on the north side 

 of the desert at about 1,000 meters (3,250 feet), where it enters the 

 mouth, of the open canon leading from Mohave to Tehachapi, and ranges 

 about 45 meters (150 feet) higher than Larrea. It reaches its western 

 limit in Antelope Valley. 



Walker Pass. — Common at the east mouth of Walker Pass, ranging 

 up to about 1,100 meters (3, GOO feet) thus exceeding the Larrea by 

 about 30 meters (100 feet). 



Owens Valley. — Common in the extreme south end of the valley on 

 the east side, and found in scattered patches from Lome Pine south, 

 and all along the west side of Owens Lake and thence south to Haway 

 Meadows. 



NEVADA. 



Pahrump Valley. — Common in the Larrea on the east side of the val- 

 ley, where it finds its upper limit with that of Larrea on the southwest 

 slope of the Charleston Mountains at 1,310 meters (4,400 feet). 



Vegas Valley. — Covers the valley with Larrea and ranges up on the 

 west side to about 1,130 meters (3,700 feet). 



Muddy Mountains. — Common in Larrea atthe Great Bend of the Colo- 

 rado whence it extends northward over the low summits of the Muddy 

 Mountains between Callville and the Virgin. 



Valley of the Virgin and Lower Muddy. — Abundant in dry places with 

 Larrea, particularly on gravel slopes. Common also on the high mesa 

 between these two rivers, where it is abundant along the boundary 

 between Arizona and Nevada. 



Pahranagat Valley. — Common on the gravel benches with Larrea in 

 the southern and southwestern parts of the valley, but not evenly dis- 

 tributed and not reaching the northern part of the valley at all. It runs 

 up an open canon leading from Pahroc Plain into Pahranagat Valley, 



