52 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



QUERCUS DUMOSA Nuttall. 

 CALIFORNIA SCRUB OAK. 



This scrubby oak was found on both sides of the Coast Range 

 Mountains, in Calif ornia, its range extending to the Pacific coast and 

 neighboring islands of the Santa Barbara group. It belongs to the 

 Upper Sonoran Life Zone, in some places reaching the Lower 

 Sonoran. 



QUERCUS EMORYI Torrey. 

 EMORY OAK. 



This evergreen black oak was first met with going westward 

 in the Dog Mountains in Grant County. New Mexico, and was com- 

 mon thence to La Osa (Monument No. 140). at the western extremity 

 of the Pajaritos Mountains. With the exception of Quercus oblonyi- 

 folia, it> distribution is lower than the rest of the oaks. On the 

 west side of the San Luis Mountains the lowest tree in prolongation 

 of Turkey Canyon i^ a cherry at 1,680 meters (5,510' feet) and the 

 second an Emory oak at 1,683 meters (5,520 feet). From this point 

 it. is common up to ('>..'>()() feet ( 1,981 meters) altitude. On the east 

 side of the San Luis Mountains, near White Water, it was found at 

 1,654 meters (5,425 feet) altitude. On the Dog Mountains its range 

 extends from the base up to the altitude of 1,753 meters (5,750 feet ), 

 where it ends with the one-seed red juniper. On the San Jose 

 Mountains, near Gallina Spring, it was found as high as 1,963 meters 

 (6,440 feet). The Emory oak i- the most common and the most 

 valuable tree of its genus in Arizona. Its acorns are sweel and 

 toothsome, its foliage glossy and beautiful, and its trunk tall and 

 straight. It occurs in the upper Sonoran Zone, but seldom penetrates 

 the Transition Zone. The finest specimens grow in valleys, usually 

 near streams. The largest ones seen along the Boundary were in the 

 Pajaritos Mountains. Some of these were nearly :'>0 meters (100 feet) 

 in height and about 1 meter (3 to 4 feet) in diameter. 



QUERCUS CHRYSOLEPIS Liebmann. 

 CANYON LIVE OAK. 



This is an evergreen shrub on the tops of the highest mountains 

 of the Elevated Central Tract, becoming a small tree lower down on 

 the slopes of these mountains. The leaves are small, coriaceous, 

 and glossy: sometimes entire, but the young -hoot- usually bear 

 spine-angled leaves which resemble those of the holly. On Nigger 

 Head peak of the Huachuca Mountains its range extends from the 

 altitude of 1,951 meters (6,400 feet) upward. Specimens were taken 

 at 6,400 feet from a tree 2 feet in diameter and •_'•'» feet in height. At 



