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CCLXXIII. E. canaliculata Maiden.

In Journ. Roy. Soc. N.S.W., liv, 171 (1920).

FOLLOWING is the original description:—

“Grey Gum” alta, in cortice læve maculis lenticularibus. Ligno pallido, fibris crassis, duro. Foliis juvenilibus petiolatis, lanceolatis, venis tenuibus. Foliis maturis, angusto-lanceolatis, paullo crassis, venis tenuibus fere parallelibus angulum ca 45° cum costa formantibus. Alabastris magnis, clavatis, umbellis ad 6 capitulo pedunculis applanatis; operculo hemiellipsoideo, mucrone breve. Fructibus magnis, conoideo-hemisphericis, pedicello breve applanato, calycis tubo duobus costis prominentibus margine paullo rotundata conspicua.

A tall Grey Gum, whose trunk usually averages scarcely 2 feet in diameter, but it may attain, exceptionally, twice that size (A. Rudder). It is a tall tree with a diameter of 4 feet, 70 feet to the lowest branches, the whole tree being 90–120 feet high (J. L. Boorman, also speaking of a Dungog tree). Bark smooth, but with lenticular patches in places, like that of a Grey Gum (E. punctata).

Timber pale coloured, somewhat coarse-fibred, interlocked and tough, resembling that of Spotted Gum (E. maculata) a good deal, and also that of Tallow-wood (E. microcorys). The colour of the timber approximates to pale snuff-brown, say, Dauthenay, Rep. de Couleurs, Plate 2, shade 303.

Juvenile leaves not seen in the earliest state, but some still opposite are lanceolate to broadly-lanceolate, equally green on both sides, with numerous fine, not prominent, roughly parallel veins, at an angle of about 45 degrees with the midrib. Leaves about 5 or 6 cm. long, and about half that width, with petioles of 2 cm.

Mature leaves of medium size, narrow-lanceolate, petiolate, say 1–2 dm. long and 2–3·5 cm. broad with petioles say 2–3 cm. long, dark green, moderately thick venation almost as in juvenile leaves.

Buds large, clavate, umbels up to six in the head on flattened expanding peduncles 2 cm. long and more, the calyx-tubes with one or two opposite sharp ridges, gradually tapering in short but distinct thick pedicels, the operculum hemi-ellipsoid with a short mucrone, each bud with a second deciduous operculum which leaves a sharp commissural edge.

Anthers white, opening in parallel slits, the cells cohering at their edges; versatile, gland at the back.

Fruits large, about 1·7 cm. in greatest width and about the same in depth, including the tips of the capsule. Conoid-hemispherical, the shiny calyx-tube with a short-flattened pedicel, the continuation of the edges of which forms two somewhat sharp ridges. The calyx-tube is surmounted by a slightly-domed conspicuous rim of about 3 mm. in width (which rim morphologically consists of a fusion of the disc and of the staminal ring). This again is surmounted by a pudding-basin rim barely 2 mm. wide. Valves triangular, moderately exsert.

Type.—Seven miles from Dungog on the Booral-road (Augustus Rudder, J. L. Boorman). The specific name is given in reference to the channelled appearance of the fruit.

Illustrations.—See my “Forest Flora of New South Wales,” fig. D, Plate 37, Part X (fruits); the same drawing reproduced in the present work, Part XXIX, fig. 1, Plate 123. For mature leaf, buds and anther, see figs. 9ac, Plate 122 of the present


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work. The specimens “fruit rather globular, but not perfectly ripe,” Spit-road, Manly, Port Jackson (J. L. Boorman), figured at fig. 3, Plate 123, do not belong to E. punctata var. grandiflora (E. canaliculata); they belong to E. punctata, though they are rather larger than those of the type.

Synonym.

E. punctata DC., var. grandiflora Deane and Maiden, in Proc. Linn. Soc. N.S.W., xxvi, 133 (1901).

Range.

It seems to be confined to New South Wales. “I have only observed the large-fruited Grey Gum in the counties of Gloucester and Durham. It seems, so far as I have seen, to occupy the intermediate country a little back from the coast to near the eastern slopes of the Dividing Range. I do not think it is very plentiful, but small patches of it are occasionally met with, besides isolated trees, and it often associates more or less with the small-fruited Grey Gum, E. propinqua.” (The late Augustus Rudder in a letter to the writer, dated 31st August, 1893.)

It grows in company with Ironbark (E. paniculata) and abundance of E. saligna. It is very scarce in the Dungog district (J. L. Boorman).

Affinities.

1. With E. saligna Sm.

The similarity of these trees is chiefly in their barks, but the differences between them in this respect have been already stated. Mr. Boorman says that, at Dungog, the direction of the branches in E. canaliculata is more horizontal and the shape less inclined to be pyramidal as in E. saligna. The floral organs and the timber, of course, sharply separate them. (See Plates 99 and 100, Part XXIII, of the present work, for E. saligna.)

2. With E. punctata DC.

The new species is nearer E. punctata (indeed, it has been regarded as a variety of it) than E. saligna, but the discovery that E. canaliculata has a pale timber at once showed that it must be removed from E. punctata and other species with red timbers. For drawings of details of E. punctata see the present work, Part XXIX, Plates 121 and 122, while that of E. canaliculata are in the same Part (as E. punctata var. grandiflora)


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in Plates 122 and 123. The anthers of the two species are alike. The outstanding difference shown there is in the smaller size of the buds and fruits of E. punctata, their less tendency to vertical angularity, and less marked commissural edges. The juvenile leaves are broader in E. punctata.

3. With E. maculata Hook.

We have undoubted affinities in the smooth, more or less blotched bark, and also in the timber, for both are remarkably alike in external characters. But E. maculata (Plate 178, Part XLIII) is a well defined member of the Corymbosæ, and the differences are very great, as regards the organs.

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