PRINCIPAL SPECIES OF EUCALYPTS GROWN IN AMERICA. 71 



and sometimes attain a height of over 100 feet in Australiu. The ))ark 

 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 (juite thick and 

 shiny, the two sides being similar in appearance. (See PI. LXXXII, c.) 

 The flowers are large and (luite 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 PI. LXX.) 



Climatic I'tqti! rem cuts. — 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, l)ut is injured somewhat in the latter situ- 

 ations when the mercury falls below 'li) F. 



Usts. — The timber of this tree is hard and strong, and is used for 

 fences, ties, posts, and fuel. 



Eucalyptus paniculata. 



White Ikox Bahk. 



Chai-acteristies. — The trees of this species are usually below medium 

 size, the maximum height 1)eing 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 barlj of the trunk is usually hard, 

 rough, and of a grayish-brown color. (PI. XXXIV.) In some cases, 

 however, it flakes ofl', 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. 



CJimatic 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. 



UseH. — This tree furnishes a timber that is hard and durable, ])eing 

 one of the very valua])le timber trees of Australia. It is useful 

 wherever strength, hardness, and durability are desirable. 



Eucalyptus pilularis. 



Black lUTT. 



Charactrristicx.—ThiH 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, 

 th(^ average height is 100 to 150 feet, with a diameter of 3 to 5 feet. 



