PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. 75 
Climatic requirements.—The Red Mahogany grows quite well in the 
coast region of California, but does not thrive in the dry interior val- 
leys. It does not resist severe frost, nor does it endure high temper- 
atures in a dry atmosphere. It is well suited to moist, semitropical 
climates, being confined in Australia almost exclusively to the warm 
coast districts. 
Uses.—The tree furnishes a timber that is very strong, hard, and 
durable. It is usedin Australia for piles, posts, paving, shingles, and 
general building purposes. Mr. Maiden says in his ‘* Useful Austra- 
lian Plants:” 
This is one of the most valuable hard woods of the colony [New South Wales]. It 
is arich red color, resembling true mahogany a good deal in appearance. It is a 
grand furniture wood where its weight is not against it. * * * Itis one of the 
most durable timbers we have, being greatly resistant to damp and the attacks of 
white ants. 
This Eucalypt can be used as a forest cover, as a shade tree, and asa 
wind-break where it is too moist and warm for other species, and will 
at the same time be a source of valuable timber. 
Eucalyptus robusta. 
Swamp MAHOGANY. 
Characteristics. —This is a tree symmetrical in form and of medium 
size. In the Southwest it has not yet exceeded a height of 50 feet and 
a diameter of 1 foot, but in Australia it is said to attain a height of 
100 feet, with a trunk sometimes 50 feet long and nearly 4 feet in 
diameter. The heavy foliage and spreading habit give the tree astately, 
robust appearance, hence its specific name, 7vobusta. (See Pl. XX XVII.) 
The rusty gray bark is persistent and is usually wrinkled and fur- 
rowed. ‘The bark of the branches frequently flakes off, leaving them 
smooth. ‘The leaves are large and leathery, sometimes being 6 inches 
long and 2 inches wide. (See Pl. LX XIII.) The upper side is dark 
green, the lower a paler green color. The cream-colored flowers are 
large and quite abundant, growing in clusters of 3 to 10 on stout, 
usually flattened stocks. The seed cases are goblet-shaped, or some- 
times urn-shaped, and occasionally slightly angled. (See Pl. XCI.) 
Climatic requirements.—Vhe tree thrives at and near the coast, but 
does not endure well the dry heat of the interior. In its native coun- 
try it grows in warm, swampy coast localities, but in the Southwest 
it will grow in quite a variety of situations if supplied with sufficient 
water. It has been much planted as an avenue tree in the Southwest, 
but after a few years it usually makes an irregular, unsatisfactory 
growth, unless the roots are kept quite moist. It ought to thrive 
along the coast of the Gulf of Mexico, in regions free from heavy 
frosts. 
