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The roots have nodules that contain nitrogen-fixing bacteria, which allows them to survive in sandy soils with low nutrient levels. In the first few years, the slow growing tree develops a fast growing tap-root that can reach a depth of over 10 metres (33 ft) and access any sub-surface water. [11]
Allocasuarina, commonly known as sheoak [4] or she-oak, [5] is a genus of flowering plants in the family Casuarinaceae and is endemic to Australia. Plants in the genus Allocasuarina are trees or shrubs with soft, pendulous, green branchlets, the leaves reduced to scale-like teeth.
Allocasuarina huegeliana, commonly known as rock sheoak [3] 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 14–35 mm (0.55–1.38 in) long containing winged seeds (samaras) 5–7 mm (0.20–0.28 in) long.
Allocasuarina luehmannii is a dioecious tree that typically grows to a height of 5–15 m (16–49 ft) and has furrowed bark. Its branchlets are more or less erect, up to 400 mm (16 in) long, the leaves reduced to scale-like teeth 0.5–1 mm (0.02–0.04 in) long, arranged in whorls of ten to fourteen around the branchlets.
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.
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. It is a small dioecious tree that has drooping branchlets up to 400 mm (16 in) long, the leaves reduced to scales in whorls of nine to thirteen, the mature fruiting cones 20–50 mm (0.8–2 in) long containing winged seeds 7 ...
The roots have nitrogen-fixing nodules that contain the soil actinomycete Frankia. [7] In Australia, the most widely used common name for Casuarinaceae species is sheoak or she-oak (a comparison of the timber quality with English oak). Other common names in Australia include ironwood, bull-oak or buloke, beefwood, [8] or cassowary tree. [9]
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.