PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. 09 
Eucalyptus crebra. 
NARROW-LEAVED IRON-BARK. 
Characteristics. —This iron-bark is usually a slender tree of pleasing 
aspect, growing about 100 feet high and 2 to 3 feet in diameter (PI. 
XVIII). The trunk is commonly straight and even in size. Accord- 
ing to Maiden, Sir William Macarthur pronounced it: ‘*The most 
picturesque of the different species of Kucalypts called iron-bark.” 
The bark, like that of other iron-barks, is rough and persistent. It 
is harder, darker, and more deeply furrowed than the bark of either 
Eucalyptus paniculata or Kucalyptus siderophloia, approaching 
closely to Hucalyptus sideroxylon in these respects. The wood is 
reddish, with inlocked fibers. The branchlets are slender and droop- 
ing, presenting with the foliage a pleasing appearance. 
The leaves are narrow, equally green on the two surfaces, and quite 
thin; veins and oil dots not conspicuous. ‘The flowers are very small, 
in clusters of 3 to 7, usually occurring in panicles. The seed cases 
are very sinall, goblet-shaped or cup-shaped, with minute valves. (PI. 
JUNIE) 
Climatic requirements.—Vhe narrow-leaved iron-bark endures a 
greater variety of climatic conditions than do the other iron-barks. 
It is the only one of the group that will endure the climate of the dry, 
hot interior valleys of the Southwest. At Fresno, Cal., it grows 
vigorously, and young trees have grown well at the Experiment Sta- 
tion farm near Phoenix, Ariz. It endures minimum temperatures of 
18° to 20° and maximum temperatures of 110° to 118°. It is said to 
be content with poor soil. Judging by experience with the species 
thus far, it ought to grow in most valley and hillside situations in the 
Southwest. 
Uses.—Upon account of the wood being so hard, tough, and elastic, 
the timber is useful for a great variety of purposes. It is one of the 
highly valued timber trees of Australia. The wood is durable under 
ground, and is consequently much used for posts, railway ties, and 
piles. It is also useful for bridge material, for wagon making, and 
for a great variety of technic purposes. 
Eucalyptus diversicolor. 
KARRI. 
Characteristics. —The Karri is a large and stately tree, in the South- 
west growing much more rapidly than Hucalyptus amygdalina, the 
only tree that in Australia exceeds it in height. Baron von Mueller 
pronounces it one of the grandest trees of the globe and ‘‘one of the 
greatest wonders in the whole creation of plants!” He states that he 
has seen trees of this species nearly 400 feet high, and that trees with 
