328 NORTH AMERICAN FAUNA. pSo.7. 



Amargosa Cation. — Abundant, forming dense thickets. 



NEVADA. 



Valley of the Virgin and Lower Muddy. — Common in places in the 

 dryer parts of the valley. Near an abandoned mill at St. Joe, on the 

 Muddy, it forms dense and impenetrable thickets and grows to immense 

 size, single bushes attaining a height of 4 J to 5 h, meters (15 to 18 feet), 

 with trunks 150 millimeters (about 6 inches) in diameter. 



Pahranagat Valley. — A few scattering jmtches of rather small size 

 were found. 



UTAH. 



Santa Clara Valley. — Grows in the lower valley. 



Grayia spinosa [=Grayiapolygaloidea], 



Grayia spinosa is one of the most characteristic bushes of the upper 

 division of the Lower Sonoran Zone in the deserts of the southern part 

 of the Great Basin. Owing to the peculiar green of its leaves and their 

 tendency to assume a pinkish tint, it is easily distinguishable from the 

 other brush with which it is associated. It was recorded from the fol- 

 lowing localities: 



CALIFORNIA. 



Mohave Desert. — Grayia is common in many of the higher levels of 

 the Mohave Desert. It was found as far west as Antelope Valley a 

 short distance east of Willow Spring, and a little was seen in the open 

 canon leading from Mohave to Tehachapi. 



Walker Pass. — In Walker Pass it extends up the east slope from the 

 Mohave Desert to an altitude of 1,330 meters (4,400 feet) or higher. 



Owens Valley. — Common and ranges up on the west side (Sierra Ne- 

 vada slope) to 1,525 or 1,550 meters (5,000 or 5,100 feet). On tiie opposite 

 or White Mountain slope it ranges up to 1,980 meters (6,500 feet). 



Peep Spring Valley. — Found in the bottom of the valley with Tetra- 

 dymia spinosa, Menodora spinosa, Atriplex canescens, Palea polyadenia, 

 D.fremonti, Artemisia spinescens, Lycium andersoni, and Eurotia lanata. 



NEVADA. 



Pish Lake Valley. — Abundant, ranging up nearly to Pigeon Spring 

 on the northwest slope of Mount Magruder, at an altitude of 1,980 to 

 2,010 meters (6,500 to 6,700 feet). 



Valley between Gold, Mountain and Mount Magruder. — Common, mixed 

 with Artemisia tridentata, Tetradymia glabrata, Atriplex confertifolia, 

 and a little Artemisia spinescens. 



Gold Mountain. — Common below 2,135 meters (7,000 feet) altitude On 

 the north slope, and down to 1,675 meters (5,500 feet) on the south slope. 



Sarcohatus Flat. — Tolerably common in rdaces in the northern part 

 of the flat. 



Oasis Valley. — Not common. Found from 1,220 meters (4,000 feet) up- 

 wards. 



