Corymbia K.D. Hill & L.A.S. Johnson

Corymbia comprises about 115 species, all but five of which are endemic to Australia, occurring in all states except Tasmania. The genus was split from Eucalyptus relatively recently (Hill & Johnson 1995); while not all eucalypt enthusiasts accept this subdivision of the genus (and further splits have been proposed), the prevailing opinion seems to be to recognise three genera: Angophora, Corymbia and Eucalyptus. Corymbia species are trees (rarely mallees) with persistent or shedding bark. The leaves are typically dimorphic: juvenile leaves are opposite, adult leaves alternate with closely spaced lateral veins and oil glands. Inflorescences are terminal or lateral, often extensively branched, and composed of numerous seven-flowered (rarely three-flowered) umbellasters. The flowers are hermaphrodite, 4– or 5-merous, and have a cup-shaped hypanthium; the sepals are fused into a calyptra; the petals are free, but fused to the calyptra, or fused together forming an inner calyptra. The fruit is a woody capsule with valves included (Hill 2002c). There is no single character that distinguishes Corymbia from Eucalyptus; in Corymbia the bark splits in small polygonal scales, and the inflorescences are compound and terminal, comprising regular umbellasters, which are conspicuous on the outside of the crown.