MAMMALS OF THE MEXICAN BOUNDARY. 57 



VAUQUELINIA CALIFORNICA (Torrey) Sargent. 

 VATjaUELIMIA. 



A handsome tree, about 3 to 5 meters (10 to 15 feet) in height, 

 growing sparsely on the otherwise barren hills bordering the Guada- 

 lupe Canyon, in the adjacent corners of Arizona, New Mexico, Chi- 

 liuahua, and Sonora. A tree that was photographed grew at the 

 altitude of 1,402 meters (1,600 feet) in the southeastern corner of 

 Arizona. 



CERCOCARPUS PARVIFOLIUS BETULOIDES (Nuttall) Sargent. 

 BIRCHLEAF MAHOGANY. 



A tall shrub or small tree, abundant in the mountains of the Coast 

 Range in California. 



CERCOCARPUS PARVIFOLIUS PAUCIDENTATUS Watson. 

 ENTIBELEAF MAHOGANY, 



This is the common mahogany of the mountains of the Elevated 

 Central Tract. It was found at the summit of the Hachita Grande 

 (altitude 2,545 meters, or 8,350 feet) and in canyons of the Dog 

 Mountains (altitude 1,868 meters, or 6,129 feet) ; is common on the 

 lower slopes, ranging also to the highest summits of the San Luis, 

 Animas, and San Jose mountains, and is also common on the Hua- 

 chuca, Patagonia, Pajaritos, and other moutains of southern Arizona, 

 as well as at Bakers Butte, in central Arizona. 



ADENOSTOMA SPARSIFOLIUM Torrey. 

 RES-SHANK 0HAMI80. 



A very attractive small tree of the west slopes of the Coast Range 

 Mountains, found by us from Jacumba Spring (Monument No. 233) 

 west to Pine Valley, California, and Nachoguero Valley, Lower Cali- 

 fornia, its range being much narrower than that of the common 

 shrubby chamiso (Adenostoma fasciculatum oitusifolmm S. Wat- 

 son). The "red-shank" has red branches, reddish shreddj' bark, 

 and bears small white flowers copiously in June. 



AMELANCHIER ALNIFOLIA NuttaU. 

 WESTERN SERVICE TREE. 



A small tree, at the summit of the Coast Range (Laguna Moun- 

 tains), California. 



HETEROMELES ARBUTIFOLIA (Poiret) Roemer. 

 TOYON; CHRISTMAS BERRY, 



A small tree, ranging from the Santa Barbara Islands up to about 

 1,372 meters (4,500 feet) altitude on the west slope of the Coast 

 Range Mountains, in California and northern Lower California. 

 The form which we found on San Clemente Island grows to be a 

 larger tree with broader leaves than that of the mainland. 



