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CCXXXIV. E. Dawsoni R. T. Baker.

In Proc. Linn. Soc. N.S.W., xxiv, 295 (1899), with a Plate (XXI).

E. Dawsoni is referred to at Part XIII, p. 109 of the present work (1911), but is there looked upon as a synonym of E. polyanthemos. In Part LIX, p. 242, of my “Forest Flora of New South Wales” (1916) I was inclined to recognise E. Dawsoni as a separate species, but hesitated, for reasons stated. I have now come to the conclusion that E. Dawsoni is sufficiently distinct.

Following is the original description:—

A tall tree with a smooth bark, the foliage, branchlets, buds and fruits glaucous. Young leaves broadly lanceolate 6 inches long and over 3 inches wide, on a petiole over an inch long, very obtuse, glaucous on both sides, venation distinct. Mature leaves mostly short, oblong-lanceolate, very obtuse, rarely acuminate, occasionally reddish in colour, venation fairly distinct, lateral veins not distant, intramarginal vein close to the edge. Peduncles axillary but mostly in large terminal corymbs, exceeding the leaves. Buds on young trees 3 lines long, 1½ lines in diameter, sessile or on short pedicels; operculum hemispherical, obtuse; on mature trees 4 to 5 lines long, 1 line in diameter, the calyx tapering into a filiform pedicel, operculum conical, acute. Ovary domed at the summit. Stamens all fertile, inflexed in the bud, filaments thick in proportion to the diameter of the anthers. Anthers very small, cylindrical, rounded at the base and truncate at the top, opening by terminal pores. Fruit small, turbinate, pedicel almost filiform, mostly a line in diameter and under 2 lines long, rim thin, capsule sunken, valves not exserted.

Illustrations.

It is figured (as E. polyanthemos) in Plate 58 (Part XIII) of the present work, under the following figures:—4, 9, 10, 11. With the figures now submitted (5–8, Plate 175) it is suggested that the characters of the species are clear.

Synonym.

None, but hitherto included by me in E. polyanthemos. It is undoubtedly a geminate species.

Range.

The species is confined to New South Wales as far as we know. In the original description we have the following localities. “Ridges on the watershed of the Goulburn River (R. T. Baker); across the main Divide at Cassilis, and north-west to Pilliga (Prof. W. H. Warren).”




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To which may be added the following, some of which are supplementary localities.

Bylong, 32 miles from Rylstone (R. T. Baker). The type. Also Murrumbo. “Red Box, Slaty Gum,” Gulgong (J. L. Boorman and J.H.M.).

Cobborah (between Dubbo and Dunedoo) (District Forester Marriott). Dunedoo (Forest Guard C. H. Gardner).

“Red Gum Nos. 1 and 2.” Murrurundi (Forester L. A. Macqueen, 1913). Baerami, Denman (R. H. Cambage, Nos. 2710, 2711).

The following specimens of E. Dawsoni in the National Herbarium, Melbourne, were looked upon by Mueller as E. polyanthemos. “Ridges near Mudgee” (Rev. Dr. Woolls, October, 1886); Mudgee road (Woolls), under E. polyanthemos in B.Fl. iii. 214.

Affinities.

With E. polyanthemos Schauer.

I think that Part XIII, p. 114, &c., of this work, and Part LIX, p. 214, &c., of my “Forest Flora of New South Wales” are eloquent as to the affinities of the two species.

Mr. Baker, in his original description of the species (op. cit., p. 296) does not clearly contrast it with others. Speaking of it and E. polyanthemos he says:—“The sucker and mature leaves of both species are different as well as the venation. The leaves of E. Dawsoni are almost always glaucous, as well as the buds and fruits, a feature rarely found in E. polyanthemos.”

The describer speaks of E. Dawsoni as a tree with a smooth bark—growing “to a great height with a splendidly straight, branchless trunk, and always occurs under the ridges, never being found on the summit nor at the base.” It seems to me that the most outstanding differences between the two species consist in the larger size, the more erect habit, and the smoother bark of E. Dawsoni.

I cannot satisfy myself that there are important differences in the juvenile leaves of the two species; the mature leaves are more commonly orbicular, or comparatively broad, in E. polyanthemos, the foliage of E. Dawsoni being more commonly lanceolate.

The fruits of E. Dawsoni appear to have thinner walls, and to be more conical than those of E. polyanthemos; the latter are usually more pear-shaped. At the same time the fruits are often so similar that they are not easily separated.

The staminal ring (fig. 7a, Plate 175) seems more deciduous, with the stamens attached, in E. Dawsoni than in E. polyanthemos, but this is a matter for investigation with additional material.

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