Bursaria occidentalis

Bursaria occidentalis is a tree that typically grows to a height of 8 m (26 ft), sometimes a shrub to 1.2 m (3 ft 11 in), and usually only has spiny branches when young. The adult leaves are egg-shaped with the narrower end towards the base, hairy on the lower surface, 30–70 mm (1.2–2.8 in) long and 5–10 mm (0.20–0.39 in) wide on a petiole 3–8 mm (0.12–0.31 in) long. The plants have both andromonoecious and bisexual flowers borne in groups on the ends of branchlets, each flower on a pedicel 3–6 mm (0.12–0.24 in) long. The sepals are hairy, less than 2 mm (0.079 in) long and spread from their bases and the petals are creamy-white, 5–6 mm (0.20–0.24 in) long and also spread from their bases. Flowering occurs from August to December and the fruit is an inflated capsule 10–11 mm (0.39–0.43 in) long and wide containing winged, brown seeds.

This bursaria grows in mallee woodland between Shark Bay, Dongara and Menzies in the Avon Wheatbelt, Coolgardie, Geraldton Sandplains, Murchison and Yalgoo biogeographic regions of Western Australia. In some places it may be the only tree species.