Northern grey ironbark

Eucalyptus siderophloia, the northern grey ironbark, is a large evergreen tree in the myrtle family (Myrtaceae), native to the coastal and subcoastal forests of eastern Australia from southeastern Queensland to north-eastern New South Wales. Mature trees commonly reach 25-40 meters in height with a straight bole carrying the characteristic ironbark — a deeply furrowed, hard, dark grey to almost black, persistent and impregnated with kino — that gives the species and its relatives their group name. Juvenile leaves are opposite, broadly ovate, and dull bluish-green; adult leaves are alternate, lanceolate to falcate, 8-18 cm long and 1.5-3 cm wide, glossy green on both surfaces, with prominent lateral veins forming a distinct intramarginal vein. Inflorescences are axillary compound umbels each bearing 7 (sometimes more) buds; the buds are diamond-shaped to fusiform, 5-9 mm long, with a conical operculum. Flowers are creamy-white with many showy stamens. Fruits are small hemispherical to truncate-ovoid capsules 4-7 mm in diameter with three or four enclosed valves. The species is an important timber tree producing extremely hard, durable, termite-resistant wood.