Tree to 20 m. Bark rough, flaky, fibrous on trunk and lower parts of main branches, then smooth, grey above. Juvenile leaves ovate, green, discolorous. Adult leaves lanceolate, uncinate; lamina 7–16 cm long, 1.2–2.5 cm wide; lateral veins conspicuous, at 35°–45°; intramarginal vein up to 1 mm from margin; petiole terete, channelled or flattened, 8–15 mm long. Peduncle flattened, usually recurved, up to 2.5 cm long; pedicels thick, 3–6 mm long. Operculum cylindrical-conical or horn-shaped, expanded at base, 10–15 mm long, 5–6 mm wide; hypanthium campanulate, 5–10 mm long, 5–6 mm wide. Fruits campanulate, faintly striated, 8–15 mm long, 7–11 mm wide; disc narrow, obscured by a prominent staminal ring, descending; valves 4, curved outwards.
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