8o 



of Agriculture 1949 



is pyramidal to columnar in form and 

 is fast growing. The medium-sized and 

 rounded, bright-green leaves cast a 

 medium shade. Of average longevity, 

 it is hardy and slightly tolerant of al- 

 kali. It grows best in moist sites. Only 

 the male trees should be used in order 

 to avoid the disagreeable fuzz that is 

 shed from the blooms of the female. 



This and the other more spreading 

 types of poplar are especially adapted 

 as shade or roadside trees in moun- 

 tain valleys or around irrigated pas- 

 tures in the lower inland valleys. Suck- 

 ers are sometimes troublesome. Poplars 

 should not be planted close to sewer 

 lines because of the penetrating roots. 



PIN OAK forms a rounded, pyram- 

 idal tree when young but tends to be- 

 come irregular at maturity, with a 

 height of 50 to 80 feet. The deeply 

 cut, glossy, dark-green leaves cast a 

 medium-dense shade and turn an at- 

 tractive scarlet in the late fall. The 

 tree grows at a moderate rate and is 

 hardy and long-lived but not tolerant 

 of alkali nor resistant to drought. In 

 California, pin oak is a desirable street 

 and shade tree for both inland and 

 coastal districts where extra moisture 

 can be supplied during the summer. 



SOUTHERN RED OAK is a round- 

 topped tree with spreading branches, 

 50 to 70 feet high at maturity. The 

 leaves are medium large, incised, dark 

 green above and pale below, and dark 

 red in late fall. It casts a medium 

 shade. Its growth rate is relatively 

 rapid. It is fairly long-lived, but is not 

 drought-resistant or tolerant of alkali. 

 It resembles pin oak in uses as well as 

 in its range of suitability. 



THE CALIFORNIA BLACK WALNUT, a 

 large, irregularly rounded tree that is 

 50 or more feet high at maturity, usu- 

 ally is taller than broad and branches 

 from the trunk rather high above the 

 ground. Its bark is furrowed. The 

 dark-green leaves are divided into 

 many leaflets and cast a medium-dense 

 shade. Growth rate is rapid. It is long- 



lived, fairly tolerant of alkali, and 

 drought-resistant. The hard, rounded 

 nuts are borne in a green husk and 

 mature in late fall. It is a desirable 

 roadside and shade tree for coastal and 

 interior valleys in locations where the 

 falling nuts are not objectionable. It 

 stands dry winds well. 



THE CHINESE PISTAGHE is a round- 

 topped, fairly long-lived tree, 40 to 60 

 feet high when mature. Its growth 

 rate is moderately rapid. Its attractive, 

 divided foliage becomes highly colored 

 in late fall. The flowers are incon- 

 spicuous. The female trees bear pend- 

 ent, open sprays of small fruits that 

 are scarlet in late summer and purplish 

 in fall. It is hardy everywhere in the 

 region except at high altitudes. It is 

 moderately alkali-tolerant and is es- 

 pecially adapted to dry climates for 

 shade or roadside planting. It is not 

 desirable as a street tree because of 

 the many fruits of the female trees. 



THE PANIGLED GOLDENRAIN-TREE IS 



a rather low, widespreading, round- 

 headed, deciduous tree, 20 to 30 feet 

 high at maturity and somewhat open in 

 habit. It casts a light to medium shade. 

 The leaves, composed of many fine 

 leaflets, are dark green above and paler 

 beneath, and give a soft, fernlike ap- 

 pearance. The profuse yellow flowers 

 are borne in large clusters in late sum- 

 mer. The fruit is a papery-walled cap- 

 sule and remains on the tree until fall. 

 The growth rate is fairly rapid. It is 

 hardy and its length of life is about 

 average. The tree is drought-resistant 

 and will tolerate alkali, including black 

 alkali, to a greater extent than almost 

 any tree known. It is therefore espe- 

 cially adapted to difficult situations in 

 the drier portion of the region where 

 few other species will succeed, but it 

 will grow well in more favored loca- 

 tions. It deserves to be more widely 

 planted. 



OF THE WHITE MULBERRY,, the Khl- 



gan fruitless variety is a fast growing, 

 broadly, round-topped, deciduous tree, 



