dwarf sheoak

Allocasuarina pusilla is a spreading, dioecious shrub that typically grows to a height of 0.2–2 m (7.9 in – 6 ft 6.7 in) and has smooth bark. Its branchlets are erect to spreading, up to 120 mm (4.7 in) long, the leaves reduced to overlapping, scale-like teeth 0.3–0.5 mm (0.012–0.020 in) long, arranged in whorls of five to seven around the branchlets. The sections of branchlet between the leaf whorls are 3–9 mm (0.12–0.35 in) long and 0.4–1 mm (0.016–0.039 in) wide. Male flowers are arranged in spikes 3–20 mm (0.12–0.79 in) long, with about 8 to 11 whorls per centimetre (per 0.39 in.), the anthers 0.6–1 mm (0.024–0.039 in) long. Female cones are sessile, the mature cones shortly cylindrical to more or less spherical, 10–15 mm (0.39–0.59 in) long and 8–11 mm (0.31–0.43 in) in diameter, the winged seeds dark brown to black and about 5 mm (0.20 in) long.

Allocasuarina pusilla grows in heath on sandy soils from the Yorke Peninsula in south-eastern South Australia to the Big and Little Deserts of western Victoria in the south-east of continental Australia.