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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] At the time, it was somewhat controversial.
The genera Allocasuarina was created out of a grouping of plants formerly placed in Casuarina, because of subtle but consistent differences – Casuarina species have 6 to 20 scale-like teeth in each whorl of leaves, their samaras are grey or yellowish-brown, and the bracteoles of the fruiting cones are thin, woody and extend well beyond the ...
Female cones of C. equisetifolia. Casuarina, also known as she-oak, Australian pine [3] [4] [5] and native pine, [6] is a genus of flowering plants in the family Casuarinaceae, and is native to Australia, the Indian subcontinent, Southeast Asia, islands of the western Pacific Ocean, and eastern Africa.
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Allocasuarina torulosa is slender, usually dioecious tree that typically grows to a height of 5–20 m (16–66 ft). Its branchlets are drooping, up to 140 mm (5.5 in) long, the leaves reduced to erect, scale-like teeth 0.3–0.8 mm (0.01–0.03 in) long, arranged in whorls of four or five around the branchlets.
Allocasuarina simulans is a dioecious, rarely a monoecious shrub that typically grows to a height of 1–3 m (3 ft 3 in – 9 ft 10 in) and mainly has smooth bark. Its branchlets are up to 190 mm (7.5 in) long, the leaves reduced to erect, often overlapping, scale-like teeth 0.5–1.1 mm (0.02–0.04 in) long, arranged in whorls of six around the branchlets.
Allocasuarina thalassoscopica is a species of flowering plant in the family Casuarinaceae and is endemic to eastern Australia. It is a spreading to erect, dioecious shrub that has branchlets up to 180 mm (7.1 in) long, the leaves reduced to scales in whorls of five to seven, the fruiting cones 12–28 mm (0.47–1.10 in) long containing winged ...
Allocasuarina hystricosa is a species of flowering plant in the family Casuarinaceae and is endemic to the south of Western Australia. It is a dioecious shrub with more or less erect branchlets, the leaves reduced to scales in whorls of ten to twelve, the fruiting cones 13–30 mm (0.51–1.18 in) long containing winged seeds (samaras) 4.5–9 mm (0.18–0.35 in) long.