Subgenus Nothocalyptus L. Johnson & D. Blaxell, gen. nov.

Type species: Eucalyptus microcorys F. Muell., Fragm. 2: 50 (1860).

Trees, bark thick, persistent, fibrous and thin-flaky. Juvenile leaves glabrous, opposite for few nodes, then disjunct. Adult leaves disjunct, glabrous, markedly dorsiventral, lateral veins closely-spaced, oblique. Inflorescences of 7-flowered axillary umbellasters. Perianth 5-4-merous (flexible), carpels 4-3. Calyx reduced, of more or less free sepals, deciduous, displaced early in development by expanding calyptriform corolla. Stamens all fertile, in 4 bundles; anthers adnate, reniform, dehiscing by divergent slits. Style short. Stigma shaggy, not lobed, with long papillae. Ovules hemitropous, in 4 vertical rows in each loculus, inner integument resorbed in early development, seed testa derived from outer integument only. Cotyledons bilobed, not folded in embryo. Seeds finely reticulated or almost smooth, with the margins often toothed; hilum ventral. Fruit small, woody, capsule somewhat sunken.

Diagnosis: Hairs and bristle glands absent; sepals free, deciduous; petals calyptriform; stamens in 4 bundles; ovules in 4 vertical rows on placenta; seed testa derived from outer integument only. Umbellasters lateral.