

98. Eucalyptus dumosa. 



(A. Cunn.. Schau. in Walp. Rep . 11. 925.) 

 Bull Mallee. 



Systematic. Found only in the dry interioi "l the < ontinent, and rarely 

 attains tree form. The bark is white and smooth. Leaves lanceolate, 

 under 4 inches long, shortly acuminate, coriaceous, shining, of a dull yellow 

 colour j venation fairly prominent , lateral veins distinct, intramarginal one removed 

 from the edge. Oil glands quite obscured. Peduncles axillary, short, bearing 

 a few flowers on short pedicels. Calyx tube cylindrical, occasional!} angular, 

 almost 3 lines long; operculum short, conical. 



Fruit. Shortly pedicellate or sessile, obovoid or 

 oblong, slightly ribbed; rim narrow, sunken ; 

 valves slightly exserted ; about 3 lines long. 



The fruits might be mistaken for a small ran.. 

 E. costata. 



Habitat. Si uthern interior oi New South Wales; South Austra- 

 lia; Victoria The Kangaroo [stand species has .1 

 coarser fruit. 



REMARKS. — This species was considered In Baron von Muellei • fieti oi E incrassata, Labill., 



Imt Bentham records them as specifically distinct in the / lora lustrali nsis, and judging from the material in the 

 National Herbarium, Melbourne, we think Bentham is correct in h I ion Labillardiere's species has a 



fruit than A. Cunningham's E. dumosa. The former species occurs so I om this State that it w.i> 



found impracticable to procure either leaves foi distillation or spei imi n oi timber. I lie fruit of E. dumosa often 

 has the facies of E. oleosa, when the valves are exsei 



ESSENTIAL OIL. Leaves and terminal branchlets for distillation were 

 obtained from Coolabah, N.S.W., in October, rcjoo. The yield oi oil was 1 per 

 cent. The crude oil was amber coloured, and had an odour resembling those 

 belonging to the cineol-pinene class, and a secondary one indicating the aldehyde 

 aromadendral. The^oil was not very rich in cineol ; it contained pinene, but 

 phellandrene was absent. Aromadendral was probabhj present, although the 

 dextro-rotation of the higher boiling portion suggests the presence of the liquid 

 form of eudesmol. 



The crude oil had specific gravity at 15 C. = 0-9153 ; rotation a B + 5-8°; 

 refractive index at 20° = 1-470.;. and was soluble in r| volumes 70 per cent, 

 alcohol. The saponification number for the esters and free acid was 2-93, 



On rectification the usual amount oi volatile aldehydes came over below 

 163 C. (corr.;. Between [63-183°, 86 per cent, distilled; 24 per cent, below 

 171°); between 183-237 , 8 percent, distilled. These fractions gave the following 

 results : 



First traction, sp. gr. at 15 C. = 0-9127; rotations, + 7-8°. 

 Second ,, ,, ,, = 0-9405 ; ,, + 9-1°. 



The cineol, determined b\ the phosphoric acid in the large traction, was 

 50 per cent., indicating about \ \ per cent, in the crude oil O.M. . 



