Subgenus Idiogenes Johnson & Blaxell, gen. nov.

Type: Idiogenes cloeziana (F. Muell.) L. Johnson & Blaxell. Basionym: Eucalyptus cloeziana F. Muell., Fragm. 11: 44 (1878).

Trees; bark persistent, long fibrous-flaky, smooth on branches. Juvenile leaves with short unicellulate papillae arising from oil glands or glabrous, opposite for few nodes then disjunct. Adult leaves disjunct, glabrous, dorsiventral; lateral veins closely spaced. Renantherin present. Conflorescences expanded, terminal or lateral, anauxotelic, with unit 7-flowered umbellasters. Sepals free, reduced, deciduous by expansion of corolline calyptra. Corolla calyptriform. Anthers ovate, dorsifixed, versatile, dehiscing by parallel slits. Stigma smooth, with blunt papillae, entire. Ovules anatropous, in 4 vertial rows in each loculus. Cotyledons emarginate, reniform, not folded in embryo. Seeds elongated-cuboid; hilum terminal. Fruit rounded, woody; capsule not sunken; valves exserted.

Diagnosis: Plant glabrous or with short thin-walled papillae in juvenile stage. Conflorescences of several umbellasters, terminal or lateral, anauxotelic. Sepals free, deciduous, corolla calyptriform. Ovules in 4 vertical rows in each loculus.