Eucalyptus sieberi
Operculum hemispherical, much shorter than the floral tube. Lateral veins irregular; angle as little as 15°. Tree up to 20 m high. Bark on trunk deeply furrowed, either dark greyish-brown and stringy or almost black and resembling an ironbark; branches smooth. Leaves green or subglaucous, 9–18 x 1.5–3 cm; petioles and young branches often reddish. Umbels 7–15-flowered, axillary. Fruit pyriform, 8–11 x 7–8 mm, tapering into the pedicel; disc conspicuous, flat or depressed; valves typically 3, enclosed. Widespread south of Gosford. Ss and laterites. Fl. summer. Black Ash, Silvertop Ash