Allocasuarina littoralis, commonly known as black she-oak, is a species of flowering plant in the family Casuarinaceae and is endemic to eastern Australia. It is dioecious, or less commonly a monoecious tree or shrub, that has its leaves reduced to scales, usually in whorls of six to eight, the mature fruiting cones 10–30 mm (0.4–1 in) long containing winged seeds (samaras) 4.0–10 mm (0.2–0.4 in) long.

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