Allocasuarina tortiramula, commonly known as twisted sheoak, is a species of flowering plant in the family Casuarinaceae and is endemic to a restricted area in the south-west of Western Australia. It is a dioecious shrub that has spreading, twisted branchlets, the leaves reduced to scales in whorls of seven, the mature fruiting cones long containing winged seeds long.
Allocasuarina tortiramula is a dioecious shrub that typically grows to a height of up to about . Its branchlets are spreading and twisted, up to about long, the leaves reduced to scale-like teeth arranged in whorls of seven, around the branchlets. The sections of branchlet between the leaf whorls are long and wide. Male flowers are arranged in dense spikes long, the anthers long. Female cones are sessile, mature cones long and about in diameter, the winged seeds brown and long.[1]
Allocasuarina tortiramula was first formally described in 1989 by Eleanor Marion Bennett in the Flora of Australia from specimens collected near Lake King in 1987.[2] [3] The specific epithet (tortiramula) means "twisted branchlet".
Twisted sheoak is only known from two populations growing in and near a nature reserve to the west of Lake King, where it grows in dense, tall heath.
Allocasuarina tortiramula is listed as "threatened" in Western Australia.