29. Eucalyptus corynocalyx. 



(F.v.M., in Fragm., ii. 43, 1860.) 



Systematic. A large tree reaching in favourable situations a height of 

 120 feet, from 4 to 6 feet in diameter at the base, and as much as 60 feet to the 

 first branch. The average size, however, is about 80 feet in height. The bark 

 is smooth, and after the outer layers have been shed, has a yellow-white or yellow- 

 blue, piebald appearance. Abnormal leaves alternate, sub-rotund or ovate, short 

 petiolate, paler underneath, about 2 inches long, and i| inch wide. Normal 

 leaves lanceolate, thick, shining, about 5 inches long and i inch wide ; underside 

 paler in colour ; intramarginal vein somewhat removed from the edge, lateral 

 veins prominent, inclined at about 45 to the mid-rib. Oil glands not conspicuous. 

 Flowers borne in umbels of four to sixteen, usually below the leaves, the common 

 peduncle about J inch long. Calyx tube wrinkled, bell-shaped, 4 lines long, 

 tapering to a short pedicel ; operculum hemispherical, bluntly pointed. 



Fruit. Shaped like an urn or almost similar to an 

 egg with one end cut off, ribbed longitu- 

 dinally ; rim narrow ; valves deeply inserted ; 

 about 6 lines long, 4 lines broad. 



These fruits in general shape might be classed with 

 E. calycogona, but the ribs are much le.ss pronounced 

 and the surface not so shining, nor are they so contracted 

 below the rim. 



Habitat. Victoria, South Australia. 



REMARKS. Mueller, when describing this Eucalyptus in 1860, gave it this name, which was acknow- 

 ledged by Bentham in his " Flora Australiensis," vol. iii, p. 218 (1886). It appears, however, that in 1852 Mueller 

 had already described the same species under the name of E, cladocalyx, but discards this for E. corynocalyx in his 

 " Eucalyptographia," 1879, and Bentham follows his wishes. He must evidently have had some sound reason 

 for such alteration of nomenclature, and now that the name of E. corynocalyx runs through Eucalyptus literature 

 of the last fifty years, we have decided to fall into line with the author's wishes and use the name E. corynocalyx. 

 and not that of E. cladocalyx. 



ESSENTIAL OIL. Material consisting of leaves and terminal branchlets 

 for distillation was collected at the Kingscote end of Kangaroo Island, in June, 

 1911. The yield of oil was very small, only 3 oz. being obtained from 194 Ib. of 

 material, equal to 0-096 per cent. The crude oil was of an orange-brown colour, 

 and the odour resembled that of an oil belonging to the cineol-pinene group. 

 The secondary odour was indefinite. Phellandrene does not occur in the oil 

 of this species. The crude oil had specific gravity at 15 C. = 0-8945 ; rotation 

 D + 8-1 ; refractive index at 20 1-4779, an *d was soluble in 4 volumes 

 80 per cent, alcohol. The saponification number for the esters and free acid 

 was 7-7. 



On rectification, a few drops of acid water, with some aldehydes, came 

 over below 159 C. (corr.). Between 159-167, 28 per cent, distilled, and between 



