western she-oak

Allocasuarina zephyrea is a dioecious shrub that typically grows to a height of 0.5–2 m (1 ft 8 in – 6 ft 7 in). Its branchlets are up to 190 mm (7.5 in) long, the leaves reduced to scale-like teeth 0.4–1.2 mm (0.016–0.047 in) long, arranged in whorls of seven to nine or ten around the branchlets. The sections of branchlet between the leaf whorls are 4–15 mm (0.16–0.59 in) long, 0.6–1.3 mm (0.024–0.051 in) wide. Male flowers are arranged in spikes 10–35 mm (0.39–1.38 in) long, with 5 to 7 whorls per centimetre (per 0.39 in.), the anthers 0.7–0.9 mm (0.028–0.035 in) long. Female cones are on a peduncle 2–15 mm (0.079–0.591 in) long, and mature cones 10–25 mm (0.39–0.98 in) long and 6–11 mm (0.24–0.43 in) in diameter, containing black, winged seeds 4.0–5.5 mm (0.16–0.22 in) long. This allocasuarina is similar to A. grampiana.

Allocasuarina zephyrea is endemic to Tasmania, growing in woodland, heath, sedgeland and on rocky outcrops from the western lowlands to central and south-eastern highlands, as well as on King Island.