77 



33. Eucalyptus Lehmanni. 



(I'rciss. Herb., according to Sdiau., in \'\. 1'reiss, Vol. I, p. 127, 1845.) 



Systematic. A tall shrub or small tree, with a roughish, reddish bark 

 coming off in irregular sheets (Oldfield). Abnormal leaves orbicular to oval, 

 small, thin, petiolate. Normal leaves oblong-ovate to broad lanceolate, 'about 

 2j inches long, obtuse, very thick, intramarginal vein removed from the edge, 

 lateral veins very oblique. Flowers often twenty or more in dense heads on 

 thick recurved, sometimes flattened peduncles, i to 3 inches long. Calyx tube 2 

 to 3 lines in diameter, more or less sunk in the receptacle ; operculum cylindrical, 

 dilated at the base, obtuse, up to i \ inch long. 



Fruit.^Numerous, adnatein a cluster of twelve 

 to twenty, and well sunk in the recep- 

 tacle ; symmetry lost by compression ; 

 valves well exserted, wrinkled, acumi- 

 nate, with openings between each 

 valve, and connivent into a promi- 

 nent cone, tapering into the persistent 

 elevated base of the style ; rim very 

 narrow ; about 7 lines in diameter. 



These are easily separated from E. cornuta 

 by the absence of the receptacle enclosing the base 

 of the adnate fruits. The figure by Hooker, Bot. 

 Mag. 6140, under E. cornuta, is this species. 



Habitat. Western Australia. 



ESSENTIAL OIL. Material of this species was collected from cultivated 

 trees grown at the Werribee Sewage Farm, Victoria, in September, 1916. The 

 oil was distilled by Mr. P. R. H. St. John, at Melbourne, who submitted it to us 

 for investigation. The yield of oil he obtained from leaves and terminal branchlets 

 was equal to 0-86 per cent. Mr. St. John states that no sewage matter was 

 near the trees. 



During the first hour 60 per cent, of the whole oil distilled ; for the 

 second hour 23 per cent, distilled, for the third and fourth hours 14 per cent., and 

 for the fifth hour 3 per cent. 



The crude oil was of a light lemon colour, and the odour gave a strong 

 indication of the presence of valeraldehyde and butaldehyde. Pinene was the 

 chief terpene, and phellandrene was absent. Cineol was present in fair quantity 

 only. The crude oil was turbid when received, and did not clear on standing 

 for some months; in this peculiarity it resembled that of E. microcorys. Only a 

 small amount of ester was present. 



The crude oil had specific gravity at 15 C. 0-8964; rotation a D + 17-5; 

 refractive index at 20 = 1-4653, and was soluble in i volume 80 per cent, alcohol. 

 The saponification number for the esters end free acid was 6-7. 



