42. Eucalyptus paniculate 



(Sm., in Trans. Linn. Soc., Ill, 287.) 

 White Ironbark. 



Systematic. Often a tall tree. Bark hard, compact, furrowed. Abnormal 

 leaves broadly lanceolate, up to 7 inches long, up to 2 inches broad, pale on the 

 under side; venation indistinct, lateral veins spreading, intramarginal vein 

 slightly removed from the edge. Normal leaves lanceolate, generally under 

 6 inches long, and about i inch broad, under surface sometimes pale-coloured; 

 venation distinct, but occasionally submerged in the leaf tissue, lateral veins 

 spreading, not very oblique, intramarginal vein removed from the edge. Flowers 

 in axillary or terminal panicles, from six to ten in each umbel. Calyx under 

 3 lines in diameter on a pedicel of about the same length ; operculum conical, 

 but generally constricted at its base. 



Fruit. Urn-shaped, pyriform, or inclined to hemi- 

 spherical ; rim flat ; valves inserted or & 

 slightly exserted ; varies in length from 

 3 to 4 lines and under 3 lines in diameter, 

 slightly less in some forms. 



The fruits are not easily confounded with those of any 

 other species, except perhaps E. intertexta or E. fasci- 

 rulosa. Some fjrms hare a half-round ring below the 

 outer edge and valves deeply inserted, whilst at other 

 times the valves are exserted. 



Habitat. Coast district and Dividing Range of New South 

 \\nlrs, Victoria and Queensland. 



REMARKS. -The systematic position of this species seems now firmly established, as, owing to the 

 morphological resemblances in herbarium material, it has in the past been confounded with other species, especially 

 E. fasciculosa. The common names are unfortunate, indicating extremes of colour, whereas such do not hold. 

 The wood at first in all cases is whitish, and changes on exposure to a grey or at Port Macquarie with dark lines, 

 hence its name " Black Ironbark " in that district. The bark is deeply furrowed, hard and of a corky nature, 

 generally with less kino than obtains in other " Ironbarks." It is a slow grower, but a foliaceous tree. 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Barber's Creek, New South Wales, in October, 1900. The yield 

 of oil was o-i per cent. The crude oil was olive-brown in colour, and had a some- 

 what aromatic odour. It contained much pinene, also some cineol, but phellan- 

 drene could not be detected. The oil contained some free alcohol, to which 

 the aromatic odour was largely due. 



The crude oil had specific gravity at 15 C. = o-goi ; rotation a D + 7-8; 

 refractive index at 20 = 1-4744, and was soluble in i volume 80 per cent, 

 alcohol. 



The saponincation number for the esters and free acid as 7-11. A 

 portion of the oil was acetylated by boiling with acetic anhydride and sodium 

 acetate in the usual way. The saponincation number of the acetylated oil was 

 56-14, indicating the presence of a fair amount of alcoholic bodies. It is probable 

 that the principal alcohol is not geraniol, but its identity remains to be deter- 

 mined. It will probably be found to be terpineol. 



