Corymbia arnhemensis (D.J.Carr & S.G.M.Carr) K.D.Hill & L.A.S.Johnson

Tree 15 m tall. Forming a lignotuber.Bark rough, grey to grey-brown, thick and tessellated over at least lower trunk, more usually over entire trunk and sometimes larger branches also; branches smooth, white to pinkish or orange-grey.Branchlets lack oil glands in the pith; smooth, sometimes glaucous.Juvenile growth (coppice or field seedlings to 50 cm): stems rounded to square in cross-section, setose with bristle-glands and glaucous (waxy, not with white rubbery cuticle); juvenile leaves always petiolate, opposite to sub-opposite for ca 25–30 nodes, oblong-elliptical to ovate or lanceolate, 3.5–11.5 cm long, 2–4 cm wide, base shallowly lobed to truncate or rounded, green or glaucous, sparsely setose with bristle-glands on both surfaces with a carpet of short white simple hairs on the underside only. Adult leaves alternate, petioles 0.6–2.5 cm long; blade lanceolate to falcate, 7.5–18 cm long, 0.8–1.8(2.5) cm wide, base tapering to petiole, margin entire, apex pointed, thin-textured, discolorous, dull, green, glabrous, side-veins greater than 45° to midrib (penniveined), reticulation dense to very dense, intramarginal vein very close to edge, oil glands obscure or visible and intersectional.Inflorescence terminal compound, rhachis branches often whitish, peduncles rounded, slender, 0.4–1.5 cm long, buds 7 per umbel, pedicels slender (0.1–0.9 cm long). Mature buds narrowly pyriform to obovoid (0.4–0.6 cm long, 0.3–0.4 cm wide), glossy, smooth, scar absent (both opercula shed together at flowering), operculum shallowly rounded and often apiculate to conical, stamens inflexed, all fertile, anthers oblong, dorsifixed, versatile, dehiscing by longitudinal slits, style long and straight, stigma blunt and mop-like, locules (3)4, the placentae each with few ovules, not clearly arranged in rows. Flowers white.Fruit pedicellate (pedicels 0.1–0.9 cm long), urceolate with a short neck that is flared slightly at the rim, 0.8–1.4 cm long, 0.6–1 cm wide, smooth but speckled, disc descending vertically, valves (3)4, enclosed.Seeds brown, 5–6 mm long, ellipsoidal with terminal wing, hilum ± ventral. Cultivated seedlings (measured at ca node 10): cotyledons reniform; stems rounded or square in cross-section, prominently setose with bristle-glands; leaves always petiolate, opposite for 16+ nodes, lower leaves small, lanceolate, becoming larger and linear-lanceolate up the stem, 5–10.5 cm long, 0.7–1.7 cm wide, base tapering to truncate or rounded, green, setose on underside, a carpet of short white simple hairs also present on underside.

Usually onsandstone areas among rocks.