348 Trees of Southern California. [zoe 



Salix lasiolepis Benth. "White Willow." Arborescent, or 

 sometimes a small tree, 20 feet high, the trunk 10 inches in 

 diameter. Fls. December and January, many of the leaves 

 persisting later. Common by streams and in meadows, from 

 3000 feet altitude on the southern slope of the San Bernardino 

 Mountains to the Coast. 



Populus trichocarpaT. &, G. "Black Cottonwood." Small 

 tree, 40 feet high, the trunk 18 inches in diameter. Fls. March. 

 Along mountain streams from 3000 feet altitude on the southern 

 slope of the San Bernardino Range to the Coast; also on Santa 

 Catalina Island. 



Populus Fremonti var. Wislizeni Wats. Spreading tree 80 feet 

 high, the trunk 4 feet in diameter; or in the desert region often 

 reduced to a straggling, misshapen tree 25 feet high, with trunk 

 not exceeding 18 inches in diameter. Fls. February, March. 

 Three trees on sandy loam at San Bernardino measure respec- 

 tively 12 feet 4 inches, 11 feet 10 inches, and 8 feet 5 inches in 

 circumference, each being about 70 feet in height. Prevalent 

 throughout the entire region, mostly in the neighborhood of 

 water. It ascends the southern slope of the San Bernardino 

 Range to 2000 feet altitude, and the northern slope to 3500 feet. 

 In the San Bernardino and San Jacinto Valleys there were 

 formerly extensive groves of large trees now nearly destroyed. 

 There is also a narrow fringe of large trees along the Mojave 

 River from opposite Hesperia to Camp Cady. Elsewhere in the 

 desert region the tree is sparsely present along water courses in the 

 cafions, or, where the water is permanent, fringing its borders, as 

 at Morongo Creek. 



The species is reported in the loth Census Report (ix, 175) 

 as collected at " Colton, Parry'' but I have been unable to 

 detect it, and the late Dr. Parry was not aware of its existence at 

 that station.* 



Yticca baccata Torr. Occasionally 15 feet high, with trunk 

 less than a foot in diameter, or acaulescent, branches short, stiff 



* Populus monilifera Ait. Trees referred to this species by Prof. Sargent, 

 are in cultivation at Colton as street shade trees. Their origin is uncertain, 

 and the species has never been found in a wild state in this region. 



