Allocasuarina verticillata, commonly known as drooping sheoak,[3] is a species of flowering plant in the family Casuarinaceae and is endemic to south-eastern Australia.

Allocasuarina verticillata is a small dioecious tree that typically grows to a height of 4–10 m (13–33 ft), has fissured bark, and the penultimate branchlets are woody.

[3][4][5][6] Drooping sheoak was first formally described in 1788 by French naturalist Jean-Baptiste Lamarck, who gave it the name Casuarina verticillata in Encyclopédie Méthodique, Botanique from a tree grown in the Jardin du Roi.

It also records that "In cases of severe thirst, great relief may be obtained from chewing the foliage of this and other species, which, being of an acid nature, produces a flow of saliva — a fact well-known to bushmen who have traversed waterless portions of the country.

[14] On Kangaroo Island, A. verticillata is the preferred food of the glossy black cockatoo, which holds the cones in its foot and shreds them with its powerful bill before removing the seeds with its tongue.