PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. (71 
and sometimes attain a height of over 100 feet in Australia. The bark 
of the trunk is in some cases smooth, in age casting off thin pieces, 
and in -other cases quite rough and persistent. The branches are 
smooth and whitish, and are of about equal height, the characteristic 
giving the tree a flat-topped appearance. The bark of the small twigs 
is reddish brown. The leaves are of medium size and quite thick and 
shiny, the two sides being similar inappearance. (See Pl. LX XXII, c.) 
The flowers are large and quite conspicuous. The stalks of the clus- 
ters are flattened and the flower stems angled. The seed cases are 
somewhat bell-shaped or pear-shaped. (See Pl. LXX.) 
Climatic requirements.—This species thrives at and near the coast, 
where the minimum temperatures are not below 25° F., and it endures 
the dry heat of the valleys, but is injured somewhat in the latter situ- 
ations when the mercury falls below 25° F. 
Uses.—The timber of this tree is hard and strong, and is used for 
fences, ties, posts, and fuel. 
Eucalyptus paniculata. 
WHITE IRON BARK. 
Characteristics.—The trees of this species are usually below medium 
size, the maximum height being something over 100 feet, and in 
some parts of Australia growing only to a height of 25 or 30 feet. 
In the Southwest it has not made a promising growth, few trees being 
yet over 6 inches in diameter. The bark of the trunk is usually hard, 
rough, and of a grayish-brown color. (Pl. XXXIV.) In some cases, 
however, it flakes off, leaving the stem smooth and grayish in color. 
The leaves are of medium size, being commonly lance-shaped, or some- 
what curved. The flowers are abundant, below medium size, in clus- 
ters of 3 to 8,on rather slender, angled stalks. The seed cases vary 
from low cup-shaped to goblet-shaped. 
Climatic requirements.—This Iron Bark grows fairly well near the 
coast and in the mountains, but does not endure heat and drouth well. 
At the Santa Monica forestry station it barely survived the drouth 
of 1899-1900. 
Uses.—This tree furnishes a timber that is hard and durable, being 
one of the very valuable timber trees of Australia. It is useful 
wherever strength, hardness, and durability are desirable. 
Eucalyptus pilularis. 
BLACKBUTT. 
Characteristics.—This is a shapely, good-sized tree, attaining in Aus- 
tralia, under favorable circumstances, according to Baron von Mueller, 
a height of 300 feet and a diameter of 15 feet. According to Maiden, 
| the average height is 100 to 150 feet, with a diameter of 3 to 5 feet. 
