This section is from the book "A Research On The Eucalypts Especially In Regard To Their Essential Oils", by Richard T. Baker, Henry G. Smith. Also available from Amazon: A Research On The Eucalypts And Their Essential Oils.
Systematic. - A tree attaining a height of 80 feet and over, 2 feet in diameter, with a smooth, yellowish bark, blotched with dark-brown patches. Normal leaves coarse, broad-lanceolate to lanceolate, thick, coriaceous, often falcate, acuminate, usually under .6 inches long and 2 inches broad; sometimes abnormally narrow-lanceolate, more acuminate and thinner in texture; venation fairly distinct, intramarginal vein looped and much removed from the edge, lateral veins distant, irregularly branched, anastomosing and scarcely parallel. Peduncles axillary or lateral, angular, about 5 lines long, bearing umbels of five to seven flowers. Buds shortly pedicellate; calyx tube turbinate, 1 3/4 lines long; operculum conoidal, sometimes slightly curved, 4 lines in length on pedicels 1 to 2 lines long.
Fruit. - Hemispherical, shining, wrinkled, domed; the rim continuing the curve of the lower portion of the fruit; valves well exserted and expanded; 2 lines long and 2 1/2 lines in diameter.
Scarcely any difference exists between the shape of these fruits and its type.
Habitat. - Armidale, Marulan, New South Wales.
ESSENTIAL OIL. - Leaves and terminal branchlets for distillation were received from Marulan, N.S.W., in July, 1898. The yield of oil was 0.9 per cent. The crude oil was red in colour and had an odour similar to those of the cineol-pinene oils in which aromadendral occurs. The oil was somewhat rich in cineol, thus differing from that of E. tereticnrnis itself. It also contained much less aromadendral. These two oils are analogous with those of E. punctata and E. punctata var. didyma, although reversed in the former case. The oil of E. tereticornis var. cineolifera contains pinene but not phellandrene. Esters were not pronounced, nor were volatile aldehydes present but in small amount. The oil contained some sesquiterpene.
The crude oil had specific gravity at 150 C.= 0.9112; rotation aD + 0.6°; refractive index at 200 = 1.4703, and was soluble in 1 3/4 volumes 70 per cent. alcohol. The saponification number for the esters and free acid was 3.7.
On rectification, 1 per cent. distilled below 1680 C. (dorr.). Between 168-1830, 74 per cent. distilled; between 183-2500, 10 per cent. came over, and between 250-2650, 9 per cent. distilled. These fractions gave the following results: -
First fraction, sp. gr. at 15o C.
The cineol was determined by the phosphoric acid method in the portion boiling below 1830; the result indicated 45 per cent. in the crude oil (O.M.). The lævo-rotation was due to the aromadendral.
Material for distillation was also received from Armidale, N.S.W., in June, 1907. The yield of oil was 0.94 per cent. The crude oil was red in colour, and had an odour similar to those of the cineol-pinene oils containing aromadendral. The oil was quite in agreement with that from Marulan, above, and contained the same constituents in practically the same amounts, except that it was a little richer in cineol.
The crude oil had specific gravity at 150 C. = 0.9075; rotation aD + 1.5°; refractive index at 200 == 1.4679, and was soluble in 1 1/2 volumes 70 per cent. alcohol.
The cineol was determined by the phosphoric acid method in the crude oil; the result was 57 per cent.