26(J 



146. Eucalyptus siderophloia. 



(Benth., in B.FL, iii, 220.) 

 Broad-leaved or Red Ironbark. 



Systematic. A tall tree, with a deeply-furrowed, black bark, which is 

 hard and close in the mature trees, but laminated in the younger ones, and this 

 distinguishes the tree from E. paniculata. Abnormal leaves very broad and 

 coriaceous, with a strongly-marked venation. Normal leaves lanceolate, falcate, 

 variable in size; venation prominent, the intramarginal vein near the edge of 

 the leaf Peduncles axillary or terminal, panicles corymbose. Calyx tube 

 angular, turbinate, about 3 to 4 lines in diameter; operculum long, conical, 

 acuminate or obtuse. 



Fruit. Turbinate, on a rather thick pedicel, 

 angular at the base ; rim thick ; valves 

 blunt, exserted ; under 4 lines in diameter. 



Perhaps the nearest approach in shape amongst other 

 species are the larger fruits of E. punctata. 



Habitat. Coast district from south of Port Jackson into 

 Queensland. 



REMARKS. This " Ironbark " is known by several vernacular names, but " Broad-leaved Ironbark " is 

 the most preferable, as this comparative term distinguishes it at once from the other " Ironbarks." The abnormal 

 leaves are particularly large and leathery, measuring many inches in the length and breadth. The bark has a 

 laminated character not possessed by other " Ironbarks," and is generally not so deeplv furrowed. The species is 

 easy of determination both in the field and in the herbarium. The timber sometimes resembles that of E. 

 Fergusoni. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Canterbury, N.S.W., in June, 1897. The yield of oil was very 

 small, 336 Ib. of leaves only giving 3 ounces of oil, equal to 0-06 per cent. The 

 crude oil was lemon-yellow in colour, and had an aromatic odour difficult to define. 

 It contained phellandrene, and pinene was present also. Only a minute quantity 

 of cineol was detected, but the amount of oil at our disposal did not admit of 

 rectification. The presence of an alcohol was shown by acetylating the crude 

 oil. The specific gravity of the crude oil at 15 C. = 0-9067 ; optical rotation 

 D + 14-5 ; refractive index at 20 = 1-4943. The saponification number 

 for the original ester, together with the free acid, was 4, while that of the 

 esterised oil was 41-9, thus 37-9 represented the saponification number of the 

 esters due to the free alcohols present ; if calculated for C IO H I8 O, this represents 

 10-7 per cent. The crude oil did not form a clear solution with 10 volumes 

 80 per cent, alcohol. 



