Mallet to 6 m tall. Non-lignotuberous. Bark smooth throughout, pale grey over pale orange to pale brown, shedding in broad ribbons. Branchlets lacking oil glands in the pith. Juvenile growth (coppice or field seedlings to 50 cm): stems rounded to square in cross-section; juvenile leaves always petiolate, alternate, ovate to lanceolate, 3–10 cm long, 2–6 cm wide, greyish green and dull but becoming green higher up stem. Adult leaves alternate, petioles 0.8–1.6 cm long; blade lanceolate to oblong, 4.5–9 cm long, 1–2.7 cm wide, base tapering to petiole, margin entire, apex pointed to rounded, concolorous, dull and slightly bluish green at first maturing glossy green, penniveined or with side veins acute, reticulation dense and erose, or obscure, intramarginal vein fairly close to margin, oil glands mostly intersectional. Inflorescence axillary unbranched, peduncles widening distally, pendulous, 2–4.2 cm long, bud solitary, pedicel 0.8–1.5 cm long. Mature buds oblong in outline and square in cross-section with wings at the corners, smooth in between (3.2–5.5 cm long, 1–1.8 cm wide), red in colour, scar present, outer operculum "shed" at bud-size approximately a fifth mature size and often remains stuck to apex of inner operculum as a black "scab", inner operculum prominently beaked (operculum 1–3.2 cm long), stamens inflexed, anthers oblong to globoid, versatile, sub-basifixed, dehiscing by longitudinal slits, style long and straight, stigma tapered to rounded, locules 3 or 4, the placentae each with 6 or 8 vertical rows of ovules. Flowers yellow. Fruit pedicellate (pedicels 0.8–1.5 cm long), oblong, square in cross-section and winged, 2.9–4 cm long, 1.3–3 cm wide, disc descending vertically, valves 3 or 4, enclosed. Seeds black to blackish brown, 2–5 mm long, more or less pyramidal to flattened and four-angled with a conspicuous marginal flange, dorsal surface scarcely reticulate, hilum terminal. Cultivated seedlings (measured at ca node 10): cotyledons reniform; stems rounded to square in cross-section; leaves always petiolate, opposite for 4 or 5 nodes then alternate, ovate, 2.8–7 cm long, 2–4.5 cm wide, dull, green.
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Operculum narrowly rostrate, 12–22 mm long, 7–14 mm wide; hypanthium 13–35 mm long, 7–17 mm wide.