PEINCIPAL SPECIES OF EUCALYPTS GEOWN IN AMERICA. 59 

 Eucalyptus crebra. 

 NARROW-LEAVED IHON-RAKK. 



Character ist/cs. — This iron-l)ark is usually a slender tree of pleasinj.' 

 aspect, growing- al)out 100 feet high and 2 to 3 feet in diameter (PI. 

 XVIII). The trunk is commonly straight and even in size. Accord- 

 ing to Maiden, Sir William Maearthur pronounced it: '"The most 

 picturesque of the diflerent species of Eucalypts called iron-bark.'' 

 The bark, like that of other iron-barks, is rough and persistent. It 

 is harder, darker, and more deeply furrowed than the bark of either 

 Eucalyptus jyaniculata or Eucalyptus slderopJdoia, approaching 

 closely to Eucalypytm sideroxylon in these respects. The wood is 

 reddish, with inlocked libers. The branchlets are slender and droop- 

 ing, presenting with the foliage a pleasing appearance. 



The leaves are narrow, equalh' green on the two surfaces, and quite 

 thin; veins and oil dots not conspicuous. The flowers are very small, 

 in clusters of 3 to 7, usually occurring in panicles. The seed cases 

 are verv small, goblet-shaped or cup-shaped, with minute valves. (PI. 

 LVII.)' 



Climatic rtqiurements. — The narrow-leaved iron-bark endures a 

 greater variety of climatic conditions than do the other iron-barks. 

 It is the only one of the group that will endure the climate of the dr}-, 

 hot interior valleys of the Southwest. At Fresno, Cal., it grows 

 vigorously, and young trees have grown well at the Experiment Sta- 

 tion farm near Phoenix, Ariz. It endures minimum temperatures of 

 18^ to 20^ and maximum temperatures of llO'^ to 118' . It is said to 

 be content with poor soil. Judging by experience with the species 

 thus far, it ought to grow in most valley and hillside situations in the 

 Southwest. 



Uses. — Upon account of the wood ))eing so hard, tough, and elastic, 

 the timber is useful for a great variety of purposes. It is one of the 

 highly valued timber trees of Australia. Tlu> wood is durable under 

 ground, and is consequently much used for posts, railway ties, and 

 piles. It is also useful for bridge material, for wagon making, and 

 for a great variety of technic ])urposes. 



Eucalyptus diversicolor. 



Kahhi. 



Cliaracterlxtlcx. — The Karri is a large and stately tree, in the South- 

 west growing much more rapidly than EucalyjAus amyydalhia, the 

 only tree that in Australia exceeds it in height. Baron von Mueller 

 pronounces it one of the grandest trees of the globe and "one of the 

 greatest wonders in the whole creation of plantsi'"' He states that he 

 has seen trees of this species nearly 400 feet high, and that trees with 



