PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. 73 
Eucalyptus polyanthema. 
Rep Box. 
Characteristics.—This is commonly a medium-sized tree, although 
it is said occasionally to reach a height of 250 feet in Australia. It is 
not a rapid grower, and few of the American specimens have attained 
a diameter of over 1 foot. It commonly sends up a single trunk, but 
quite frequently several stems arise from the same base. ‘The tree is 
of a spreading habit, and, with its characteristic foliage and profuse 
bloom, presents a very pleasing appearance. (PI. XXXVI.) The 
bark of the trunk and branches) is persistent, somewhat furrowed, and 
grayish in color. 
The leaves, both of the seedlings and of the adult trees, are roundish 
or broadly egg-shaped, and of an ashy or dull green hue on both 
sides. (See Pl. LX XXVII,B.) The bloom is profuse and dainty, the 
flowers being considerably below average size and arranged in branch- 
ing clusters. (See Pl. LX XI.) The seed cases are somewhat top- 
shaped and, with their stems, are quite distinctly goblet-shaped. The 
margins are thin and often indented or split. 
Climatic requirements.—This species thrives under a great variety 
of climatic conditions. It grows at and near the coast, in the foot- 
hills, on mountain sides, and in the hot, dry valleys of the interior. 
It endures minimum temperatures of 15° to 20° F. and maximum tem- 
peratures of 110° to 118° F. It is one of the few species tested at the 
Experiment Station farm near Phoenix that has been entirely unin- 
jured by either the frosts of winter or the heat of summer. There 
are probably few situations in the Southwest below 3,000 feet eleva- 
tion in which the tree would not grow. 
Uses.—The timber of this tree is very hard, Gre and durable, 
being used in Australia for railway ties, for cogs, and for the parts of 
wheels. It also makes an excellent fuel. Upon account of the pro- 
fuse bloom appearing at a time when sources of honey are limited, it 
is a useful tree for bee pasture. Its habit of growth and pleasing 
aspect render it a good shade tree. It can also be used as a wind-break 
in localities where faster growing trees will not endure the climatic 
conditions. — 
Eucalyptus populifolia. 
PoPLAR-LEAVED Box. 
Characteristics.—The tree is one of medium size, resembling con- 
siderably the preceding species.. The bark is wrinkled and more or 
less furrowed, and is persistent. The leaves are scattered on rather 
long stalks, and are roundish or somewhat egg-shaped. They are very 
shiny and a deep green on both sides. The marginal vein of the leaves 
is some distance from the edge. The flowers are very small, in clusters 
