(R.T.fe. & H.G.S., Proc. Roy. Soc, N.S.W., 1911, p. 288.) A Stringybark.

Systematic. - An average forest tree, with a stringybark, persistent on the trunk, branches smooth. Abnormal leaves broad-lanceolate, oblique, not shining, alternately petiolate, often over 9 inches long. Normal leaves lanceolate, oblique, falcate, acuminate, sub-coriaceous, about 4 inches long; venation not prominent on the upper side, intramarginal vein well removed from the edge, lateral veins very oblique. Umbels with about six flowers, usually axillary, peduncles 6 lines long, angular, sometimes flattened. Buds clavate, tapering to pedicels about 2 lines long; operculum domed, sometimes shortly pointed.

Fruit.- Oblique, campanulate in early stages, mature fruit pyriform; rim truncate or slightly countersunk; valves scarcely ex-serted; 2 to 3 lines long and 2 lines wide.

The fruits mostly resembling these are those of E. virgata or E. Sieberiana.

Habitat. Tenterfield, Upper Williams River, New South Wales.

158 Eucalyptus campanulata 234

ESSENTIAL OIL. - Leaves and terminal branchlets for distillation were obtained from Tenterfield in January, 1910. The material was collected as for commercial distillation, so that the yield is an average one. The crude oil was of a light-yellowish tint, and had a secondary odour of peppermint, due to the presence of a small quantity of piperitone. The occurrence of this constituent, and the absence of the aldehyde aromadendral, distinguishes the oil of this species from that of E. obliqua. The oil consisted principally of phellandrene, and pinene was practically absent. Cineol was detected in the portion distilling at about 1760 C, but it was very small in amount. A small quantity of crystallised eudesmol was also present. The oil of this species agrees with those of the members of the "Mountain Ash" group of Eucalypts, but in its general characters more closely approaches, perhaps, that of E. oreades than any of the others. The following results were obtained with the crude oil: -

Yield of oil per cent. ............

0.85.

Specific gravity at 150 C. .............................................

0.8804.

Rotation aD ....................................................................

- 25.8°.

Refractive index at 200 C. ..............................................

1.4847.

Scarcely soluble in 10 volumes 80 per cent. alcohol, The saponification number for the esters and free acid was 7.6.

On rectification, 1 per cent. distilled below 1750 C. (corr.). Between 175-1880, 68 per cent, distilled; between 188-224°, 11 per cent. came over, and between 224-265°. 11 per cent, distilled. These fractions gave the following results: -

First fraction, sp. gr. at 15° C.

=

0.8589; rotation aD - 34.8o ; retractive index at 20° = 1.4803.

Second

"

"

"

=

0.8714; rotation aD - 32.6°; refractive index at 20° = 1.4826.

Third

"

"

"

=

0.9224; rotation not taken; refractive index at 20° = 1.4080.

The phellandrene in the oil of this species has a less lævo-rotation than is the case with such species as E. dives, E. radiata, etc, so that the influence of the dextro-rotatory modification is assumed.

The results obtained with the oil of this species were published by us in the Proc. Roy. Soc, N.S.W., November, 1911.

Plate LXXIII.

158 Eucalyptus campanulata 235

Eucalyptus Oreades. R.T B. Rocky Towers. Hazelbrook, New South Wales