

146. Eucalyptus siderophloia. 



1 1 nth., in B.F1. m, 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 edg< oi 

 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 iii shape amongst other 

 species are the larger fruits of E. punctata. 



Habitat. Coast district from south of Port Jackson into 

 Queensland, 



REMARKS, rin- tronbark " is known by several vernacular names, but " Broad leaved tronbark is 



tlif most preferable, as this i omparati ve t< rm distinguishes it a1 once i rom the other " tronbarks." The abnormal 



leaves nn; particularly large and leathery, measuring many inches in the length and breadth. The bark ha? a 



■ I character noi possessed bj othei " tronbarks," and is generally not so deeply furrowed. The species is 



ol determination both in the held and in the herbarium. The timber sometimes resembles that of / 



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

 c-rude 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 delected, but the amount of oil at our disposal did not admit oi 

 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 

 «,, + M'5 ! refractive index at 20 = 1-4943. The saponification number 

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

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

 1 sti is due to the free alcohols present; if calculated for C IO H l8 0, this represents 

 10-7 per cent. The crude oi] did noi form a dear solution with 10 volumes 

 80 per cent, alcohol. 



