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At one time, all species were placed in the genus Casuarina. Lawrence Alexander Sidney Johnson separated out many of those species and renamed them into the new genera of Gymnostoma in 1980 and 1982, [3] [4] Allocasuarina in 1982, [4] and Ceuthostoma in 1988, with some additional formal descriptions of new species in each other genus. [5]
The genus Allocasuarina was first formally described in 1982 by Lawrence Johnson in the Journal of the Adelaide Botanic Gardens. [2] In the same paper, Johnson transferred some species previously included in Casuarina to the new genus, and nominated Allocasuarina torulosa Aiton L.A.S.Johnson as the type species. [3]
Bentham gave it the name Casuarina decussata. [5] [6] In 1982, Lawrie Johnson moved it to its current genus Allocasuarina in his revision of the she-oaks. [7] It is closely related to A. torulosa of New South Wales and Queensland. [2] The specific epithet decussata is a Latin word meaning 'like the letter X' or 'the Roman numeral ten'. [8]
Male spikes Male cone. Allocasuarina zephyrea is a species of flowering plant in the family Casuarinaceae and is endemic to Tasmania. It is a dioecious shrub that has branchlets up to 190 mm (7.5 in) long, the leaves reduced to scales in whorls of seven to nine or ten, the fruiting cones 10–25 mm (0.39–0.98 in) long containing winged seeds 4.0–5.5 mm (0.16–0.22 in) long.
Allocasuarina muelleriana is dioecious, rarely a monoecious shrub that typically grows to a height of 0.5–4 m (1 ft 8 in – 13 ft 1 in) high and has smooth bark. . Its branchlets are more or less erect and up to 120 mm (4.7 in) long, the leaves reduced to scale-like teeth 0.3–0.6 mm (0.012–0.024 in) long, arranged in whorls of five to eight around the branchle
Allocasuarina misera is a species of flowering plant in the family Casuarinaceae and is endemic to Victoria.It is a dioecious or monoecious shrub that has more or less erect branchlets up to 100 mm (3.9 in) long, the leaves reduced to scales in whorls of five to seven, the fruiting cones 9–16 mm (0.35–0.63 in) long containing winged seeds 4–6 mm (0.16–0.24 in) long.
Allocasuarina dielsiana is usually a dioecious tree that typically grows to a height of 4–9 m (13–30 ft). Its branchlets are more or less erect, up to 200 mm (7.9 in) long, the leaves reduced to scale-like teeth 0.5–0.7 mm (0.020–0.028 in) long, arranged in whorls of six to eight around the branchlets.
Immature female cones. Allocasuarina paradoxa is a species of flowering plant in the family Casuarinaceae and is endemic to Victoria.It is a dioecious or monoecious shrub that has branchlets up to 150 mm (5.9 in) long, the leaves reduced to scales in whorls of seven to eleven, the fruiting cones 13–25 mm (0.51–0.98 in) long containing winged seeds 4–8 mm (0.16–0.31 in) long.