Allocasuarina crassa

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Allocasuarina crassa
Allocasuarina crassa habit.jpg
In Royal Botanic Gardens, Cranbourne
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Casuarinaceae
Genus: Allocasuarina
Species:
A. crassa
Binomial name
Allocasuarina crassa
AllocasuarinacrassaDistributionMap8.png
Occurrence data from AVH

Allocasuarina crassa, commonly known as Cape Pillar sheoak, [2] is a species of flowering plant in the family Casuarinaceae and is endemic to a small area in far south-eastern Tasmania. It is a low shrub to small tree that is monoecious or dioecious, with spreading to erect branchlets up to 170 mm (6.7 in) long, the leaves reduced to scales in whorls of seven to ten, the fruiting cones 15–34 mm (0.59–1.34 in) long containing winged seeds (samaras) 5–8 mm (0.20–0.31 in) long.

Contents

Description

Allocasuarina crassa is a dioecious or monoecious shrub that typically grows to a height of 1–2 m (3 ft 3 in – 6 ft 7 in), or sometimes a small tree to 14 m (46 ft), and has smooth bark. Its branchlets are spreading to more or less erect, up to 170 mm (6.7 in) long, the leaves reduced to erect, scale-like teeth 1.1–3 mm (0.043–0.118 in) long, arranged in whorls of seven to ten around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are 10–20 mm (0.39–0.79 in) long and 1.2–2.0 mm (0.047–0.079 in) wide and the furrows along the branchlets are hairy. Male flowers are arranged in spikes about 20 mm (0.79 in) long, the anthers 0.8–1 mm (0.031–0.039 in) long. Female cones are cylindrical and sessile or on a peduncle up to 3 mm (0.12 in) long. Mature cones are 15–34 mm (0.59–1.34 in) long and 12–15 mm (0.47–0.59 in) in diameter, the samaras black 5–8 mm (0.20–0.31 in) long. [2] [3]

Taxonomy

Allocasuarina crassa was first formally described in 1989 by Lawrie Johnson in the Flora of Australia from specimens collected by Tony Moscal at Cape Pillar in 1976. [4] [5] The specific epithet, (crassa) means "thick" or "stout", referring to the thickness of the articles, compared to those of the related A. monolifera and A. zephyrea . [5]

Distribution and habitat

Endemic to Tasmania, A. crassa is restricted to the Cape Pillar area of the Tasman Peninsula and Tasman Island, both of which are in the Tasman National Park where there are about 100,000 mature individuals. It has a linear extent of distribution of 10 km (6.2 mi) with an area of about 20 km2 (7.7 sq mi). It grows on dolerite soils in both wet eucalypt forest and in coastal heath and shrubland. On the Cape Pillar plateau it may occur in pure, even-age stands after a long fire-free period. [2]

Conservation status

Allocasuarina crassa is listed as rare under the Tasmanian TSP Act. The main threat is inappropriate fire regimes. It is also sensitive to the introduced soil-borne pathogen Phytophthora cinnamomi . [2]

Related Research Articles

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Casuarina equisetifolia, commonly known as coastal she-oak, horsetail she-oak, beach sheoak, beach casuarina or whistling tree is a species of flowering plant in the family Casuarinaceae and is native to Australia, New Guinea, Southeast Asia and India. It is a small to medium-sized, monoecious tree with scaly or furrowed bark on older specimens, drooping branchlets, the leaves reduced to scales in whorls of 7 or 8, the fruit 10–24 mm (0.39–0.94 in) long containing winged seeds (samaras) 6–8 mm (0.24–0.31 in) long.

<i>Allocasuarina</i> Genus of flowering plants

Allocasuarina, commonly known as sheoak or she-oak, 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. Allocasuarinas are either monoecious or dioecious, the flowers never bisexual. Male and female flowers are arranged in spikes, the female spikes developing into cone-like structures enclosing winged seeds.

<i>Casuarina</i> Genus of trees

Casuarina 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. Plants in the genus Casuarina are monoecious or dioecious trees with green, pendulous, photosynthetic branchlets, the leaves reduced to small scales arranged in whorls around the branchlets, the male and female flowers arranged in separate spikes, the fruit a cone containing grey or yellowish-brown winged seeds.

<i>Allocasuarina distyla</i> Species of flowering plant

Allocasuarina distyla, commonly known as scrub she-oak, is a species of flowering plant in the family Casuarinaceae and is endemic to south-eastern New South Wales. It is a dioecious shrub that has branchlets up to 350 mm (14 in) long, the leaves reduced to scales in whorls of six to eight, the fruiting cones 13–35 mm (0.51–1.38 in) long containing winged seeds (samaras) 4.0–8.0 mm (0.16–0.31 in) long.

<i>Allocasuarina decaisneana</i> Species of plant

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<i>Casuarina cunninghamiana</i> Species of tree

Casuarina cunninghamiana, commonly known as river oak, river sheoak or creek oak, is a species of flowering plant in the family Casuarinaceae and is native to Australia and New Guinea. It is a tree with fissured and scaly bark, sometimes drooping branchlets, the leaves reduced to scales in whorls of 6 to 10, the fruit 7–14 mm (0.28–0.55 in) long containing winged seeds (samaras) 3–4 mm (0.12–0.16 in) long.

<i>Casuarina glauca</i> Species of tree

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<i>Allocasuarina verticillata</i> Species of plant

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<i>Casuarina obesa</i> Species of tree

Casuarina obesa, commonly known as swamp she-oak, swamp oak or western swamp oak, or as goolee, kweela, kwerl and quilinock by the Noongar peoples, is a species of flowering plant in the family Casuarinaceae and is endemic to southern continental Australia. It is a dioecious small tree or shrub that forms root suckers, and has drooping or spreading branchlets, the leaves reduced to scales in whorls of 12 to 16, the fruit 10–20 mm (0.39–0.79 in) long containing winged seeds (samaras) 3–5 mm (0.12–0.20 in) long.

<i>Casuarina pauper</i> Species of plant

Casuarina pauper, commonly known as black oak, belah or kariku, is a species of flowering plant in the family Casuarinaceae and is endemic to southern continental Australia. It is a dioecious tree with fissured or scaly bark, waxy branchlets, the leaves reduced to scales in whorls of 9 to 13, the fruit 13–18 mm (0.51–0.71 in) long containing winged seeds (samaras) 5.5–7.0 mm (0.22–0.28 in) long.

<i>Allocasuarina campestris</i> Species of flowering plant

Allocasuarina campestris is a species of flowering plant in the family Casuarinaceae and is endemic to the south-west of Western Australia. It is a dense, monoecious or dioecious shrub that has more or less erect branchlets, the leaves reduced to scales in whorls of seven to nine, the mature fruiting cones 19–42 mm (0.75–1.65 in) long containing winged seeds (samaras) 4.7–10 mm (0.19–0.39 in) long.

<i>Allocasuarina defungens</i> Species of tree

Allocasuarina defungens, commonly known as dwarf heath casuarina, is a species of flowering plant in the family Casuarinaceae and is endemic to a restricted area of New South Wales. It is a straggly, dioecious or monoecious shrub that has branchlets up to 120 mm (4.7 in) long, the leaves reduced to scales in whorls of five to seven, the fruiting cones 8–11 mm (0.31–0.43 in) long containing winged seeds (samaras) about 3 mm (0.12 in) long.

<i>Allocasuarina brachystachya</i> Species of flowering plant

Allocasuarina brachystachya is a species of flowering plant in the family Casuarinaceae and is endemic to the Northern Tablelands of New South Wales. It is an open, usually monoecious shrub that has branchlets up to 70 mm (2.8 in) long, the leaves reduced to scales in whorls of 5 to 7, the fruiting cones 7–14 mm (0.28–0.55 in) long containing winged seeds (samaras) 2.5–4 mm (0.098–0.157 in) long.

<i>Allocasuarina acuaria</i> Species of flowering plant

Allocasuarina acuaria is a species of flowering plant in the family Casuarinaceae and is endemic to the southwest of Western Australia. It is a dioecious shrub that has erect branchlets, the leaves reduced to scales in whorls of four on the ends of the branchlets, the fruiting cones 15–19 mm (0.59–0.75 in) long containing winged seeds (samaras) about 6 mm (0.24 in) long.

<i>Allocasuarina acutivalvis</i> Species of flowering plant

Allocasuarina acutivalvis is a species of flowering plant in the family Casuarinaceae and is endemic to the southwest of Western Australia. It is a dioecious shrub to small tree that has erect branchlets, the leaves reduced to scales in whorls of 10 to 14, the fruiting cones 15–35 mm (0.59–1.38 in) long containing winged seeds (samaras) 6–12 mm (0.24–0.47 in) long.

<i>Allocasuarina corniculata</i> Species of flowering plant

Allocasuarina corniculata is a species of flowering plant in the family Casuarinaceae and is endemic to the south-west of Western Australia. It is an erect to spreading, dioecious shrub that has more or less erect branchlets, the leaves reduced to scales in whorls of six to eleven, the mature fruiting cones 8–15 mm (0.31–0.59 in) long containing winged seeds (samaras) 3–4 mm (0.12–0.16 in) long.

<i>Allocasuarina dielsiana</i> Species of flowering plant

Allocasuarina dielsiana, commonly known as northern sheoak, is a species of flowering plant in the family Casuarinaceae and is endemic to the south-west of Western Australia. It is a dioecious tree that has more or less erect branchlets, the leaves reduced to scales in whorls of six to eight, and the mature fruiting cones 14–30 mm (0.55–1.18 in) long containing winged seeds (samaras) 8–10 mm (0.31–0.39 in) long.

<i>Allocasuarina diminuta</i> Species of flowering plant

Allocasuarina diminuta is a species of flowering plant in the family Casuarinaceae and is endemic to eastern New South Wales. It is a dioecious or monoecious shrub or small tree that has branchlets up to 230 mm (9.1 in) long, the leaves reduced to scales in whorls of six to ten, the fruiting cones 5–20 mm (0.20–0.79 in) long containing winged seeds (samaras) 3.5–5.0 mm (0.14–0.20 in) long.

<i>Allocasuarina zephyrea</i>

Allocasuarina zephyrea, commonly known as the western sheoak or western scrub sheoak, is a shrub of the genus Allocasuarina native to Tasmania. It is a common and widespread shrub occurring in Central and Western Tasmania.

Allocasuarina anfractuosa, commonly known as sinuous sheoak, is a species of flowering plant in the family Casuarinaceae and is endemic to a restricted area in the southwest of Western Australia. It is a bushy, monoecious shrub that has spreading, sinuous branchlets, the leaves reduced to scales in whorls of 11 to 15, the fruiting cones 28–35 mm (1.1–1.4 in) long containing winged seeds (samaras) 10–12 mm (0.39–0.47 in) long.

References

  1. "Allocasuarina crassa". Australian Plant Census. Retrieved 17 May 2023.
  2. 1 2 3 4 "Allocasuarina crassa". Tasmanian Government Department of Natural Resources and Environment. Retrieved 18 May 2023.
  3. "Allocasuarina crassa". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 18 May 2023.
  4. "Allocasuarina crssa". APNI. Retrieved 18 May 2023.
  5. 1 2 Wilson, Karen L.; Johnson, Lawrence A.S. (1989). George, Alex S. (ed.). Flora of Australia (PDF). Vol. 3. Canberra: Australian Government Publishing Service. p. 194. Retrieved 15 May 2023.