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1. With E. Oldfieldii F.v.M.

There has been great confusion between E. Oldfieldii and E. Drummondii, and the present species, like E. Lane-Poolei, has been carved out of the aggregate. The affinity of E. Lane-Poolei inclines to E. Drummondii, and so does the present species in general characters, but both E. Ewartiana and E. Oldfieldii are dry-country Mallees. Mueller and Tate looked upon the Elder Expedition specimens as a mountain form of E. Oldfieldii. Both species have fruits with broad rims, though the sculpture is not the same in both. The fruits of E. Ewartiana are smaller, more numerous, have long peduncles, and are distinctly pedicellate. The operculum is very different to that of E. Oldfieldii; it is hemispherical, and shows a contraction with the calyx-tube which is not observable in E. Oldfieldii. The two species also differ in other characters.

2. With E. Drummondii Benth.

Compare fig. 11, Plate 74 (E. Ewartiana), with figs. 3, 5, 6, 7, 9, 10 of the same Plate (E. Drummondii). The buds of E. Drummondii are more ovoid than those of E. Ewartiana; the former have much longer and slenderer pedicels. The shape of the fruit is different in the two species, that of E. Drummondii having a more convex rim, with the tips of the valves more exsert. The mature leaves of E. Drummondii are usually more or less ovate-lanceolate, a character not observed in those of E. Ewartiana. The juvenile leaves of E. Ewartiana are remarkably coriaceous, and so broadly lanceolate as to be almost orbicular.

3. With E. Lane-Poolei Maiden.

E. Lane-Poolei is a moderately large White Gum, found in coastal situations; E. Ewartiana is a Mallee frequenting regions of low rainfall. The foliage of the former is thin, lanceolate to narrow lanceolate; that of the latter much broader and thicker, with the juvenile foliage remarkably coriaceous and so broad as to be almost orbicular, and considerably larger than that of E. Lane-Poolei. While the texture of the operculum of E. Ewartiana is thinnish, that of E. Lane-Poolei is remarkably thick, while comparison of the figures on Plate 74, viz., 4 (E. Lane-Poolei) and 11 (E. Ewartiana) shows that they are widely different.

4. With E. accedens W. V. Fitzgerald.

In the size, paleness and extreme coriaceousness, I know only one species whose juvenile leaves resemble those of E. Ewartiana, and that is E. accedens. See fig. 8, Plate 141, of the present work. But in almost every other character the two species diverge.