Allocasuarina huegeliana

Species of flowering plant

Allocasuarina huegeliana, commonly known as rock sheoak is a species of flowering plant in the family Casuarinaceae and is endemic to Western Australia. It is a dioecious tree that has its leaves reduced to scales in whorls of eight to ten, the mature fruiting cones long containing winged seeds (samaras) long.

Allocasuarina huegeliana is a dioecious tree that typically grows to a height of and has dark, fissured bark. Its needle like branchlets are up to long, the leaves reduced to scale like teeth long, arranged in whorls of eight to ten around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are mostly long and wide. Male flowers are arranged in spikes long, in whorls of 4.5 to seven per centimetre (per 0.39 in. ), the anthers long. Female cones are borne on a peduncle long. Flowering occurs from May to December or January, and the mature cones are long and in diameter containing dark brown to black samaras long. This species is similar to A. verticillata.

This species was first formally described in 1848 by Friedrich Anton Wilhelm Miquel who gave it the name Casuarina huegeliana in Lehmann's Plantae Preissianae, from specimens collected on Mount Brown near York in 1840 by Ludwig Preiss. It was reclassified in 1982 as Allocasuarina drummondiana by Lawrie Johnson in the Journal of the Adelaide Botanic Gardens. The specific epithet (huegeliana) honours the collector of the type specimens.

Rock sheoak grows near granite in the south west of Western Australia, where it in native in parts of its range, but naturalised in other places. It occurs from the Murchison River and Mingenew, south to the south coast, and east to near Balladonia, in the Avon Wheatbelt, Coolgardie, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Murchison and Swan Coastal Plain bioregions of Western Australia.