56 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



The species was subsequently found in Guadalupe Canyon ; on Cajon 

 Bonito Creek, one of the heads of the Yaqui River; at Niggerhead 

 in the Perrilla Mountains; at the base of the San Jose Mountains, 

 Sonora; on the San Pedro River and Babocomeri Creek (altitude 

 1,481 meters, or 4,860 feet), Arizona; on the upper Santa Cruz 

 River; and it also occurs at Forts Whipple and Verde, in central 

 Arizona. Its vertical range is from 1,219 meters (4,000 feet or less) 

 up to about 1,524 meters (5,000 feet). 



UMBELLULARIA CALIFORNICA (Hooker and Arnott) NuttalL 

 CALIFORNIA LAUREL. 



This small but handsome tree was found only at or near the sum- 

 mits of the Coast Range Mountains, in the Transition zone. 



LYONOTHAMNUS FLORIBUNDUS ASPLENIFOLIUS (Greene) Brandegee. 

 SAN CLEMENTE IRONWOOD. 



A small tree on San Clemente Island, off the coast of southern 

 California. 



PLATANUS OCCIDENTALIS Linnaeus. 

 SYCAMORE. 



A very large tree; common on the banks of streams east of the 

 Pecos River, in Texas. 



PLATANUS RACEMOSA Nuttall. 

 CALIEORNIA SYCAMORE. 



The range of this sycamore is from the west slope near the sum- 

 mit of the Coast Range Mountains to the Pacific. In the neighbor- 

 hood of the Boundary Line it is a smaller tree than the Arizona 

 sycamore. 



PLATANUS WRIGHTII Watson. 

 ARIZONA SYCAMORE. 



A splendid tree, 1 to 3 meters (3. to 10 feet) in diameter and 15 

 to 30 meters (50 to 100 feet) in height, growing along streams of the 

 Elevated Central Tract. I first met with it in the Dog Mountains, 

 New Mexico. It was subsequently found along nearly every stream 

 or watercourse to the western extremity of the Pajaritos Mountains 

 of Sonora and Arizona. Its determined vertical range is from 975 

 meters or 3,200 feet (junction of Cajon Creek with the San Ber- 

 nardino River, Sonora) to 2,042 meters or 6,700 feet (San Jose 

 Mountains, Sonora). 



