PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. 61 
Uses.—The timber is strong and durable, splits readily, and is not 
liable to warp. It is useful for lumber, for fence rails, and for posts. 
The bark is used for roofing, for mats, and for strings. The leaves 
are a source of Eucalyptus oil. 
Eucalyptus globulus. 
BuiuE Gum. 
Characteristics.—This species is the best known of the Eucalypts 
and in many respects the best known tree in all the world. Baron von 
Mueller says of it: ‘‘Of the more than 1,000 different species of trees 
indigenous to Australia, Aucalyptus globulus takes the first position 
in importance, and among its own kind it is the prince of Eucalypts.” 
It is the third tallest of the species of Eucalyptus, the usual height in 
Australia being 200 to 300 feet. In California, where trees can be 
found 30 or more years old, many have attained the height of 150 
feet, and a diameter of 3 to 6 feet during these years. One tree in 
Pasadena, 25 years old, is over 5 feet in diameter. Trees set thirty 
years ago along an avenue in Santa Barbara range from 3 to 5 feet in 
diameter. (Pl. X XI.) There are many instances of these trees attain- 
ing the height of 50 or 75 feet in from five to ten years. It is without 
doubt the fastest growing tree in the world. It is friendly to new 
conditions, and, taking all its characteristics into consideration, it is 
the best all-round Eucalypt. It has been more extensively planted 
throughout the world than any other Eucalypt and probably. more 
extensively than all other Kucalypts combined. The tree varies as to 
its habit of growth, but is usually quite erect, though not always 
symmetrical in form. Bya continual flaking off of its bark in patches 
or long strips it is left smooth and greenish or grayish in color. 
Occasionally, however, trees are seen with the bark persistent, espe- 
cially near or at the base. (PI. IV, a.) 
The leaves of the young seedling and of sprouts from the tree are 
quite different from those of the adult trees. The earlier leaves have 
a dusty, light-bluish coat, and are broad and opposite on the stems 
(see Pl. LX XXIII, c), while those of the adult are smooth and elon- 
gated. The young twigs are four-sided, while those on the adult trees 
are cylindrical, or nearly so. The flowers are large and quite con- 
spicuous. They grow singly or in clusters of 1 to 3. A prominent 
characteristic of the flower bud is its rough, warty protuberances. 
The seed cases are large and nearly hemispherical in form. (See 
Pl. LX.) The seeds are larger than those of most of the species. 
Climatic requirements.—This remarkable tree has the power of 
adapting itself to a variety of climatic conditions. It thrives both in 
moist, warm regions and in quite hot, dry ones. It makes a good 
growth both in lowlands and in dry, stony uplands. Its powers of 
removing stagnant water from low situations and of maintaining a 
