Allocasuarina huegeliana
A. huegeliana woodland near Wagin
A. huegeliana: Fruit
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Casuarinaceae
Genus: Allocasuarina
Species:
A. huegeliana
Binomial name
Allocasuarina huegeliana
Occurrence data from AVH
Synonyms[2]
  • Casuarina dorrienii Domin
  • Casuarina huegeliana Miq.

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.

Description

Allocasuarina huegeliana is a dioecious tree that typically grows to a height of 4–10 m (13–33 ft) and has dark, fissured bark. Its needle-like branchlets are up to 400 mm (16 in) long, the leaves reduced to scale-like teeth 0.5–0.7 mm (0.020–0.028 in) long, arranged in whorls of eight to ten around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are mostly 8–13 mm (0.31–0.51 in) long and 0.8–0.9 mm (0.031–0.035 in) wide. Male flowers are arranged in spikes 20–100 mm (0.79–3.94 in) long, in whorls of 4.5 to seven per centimetre (per 0.39 in.), the anthers 0.8–1.2 mm (0.031–0.047 in) long. Female cones are borne on a peduncle 3–5 mm (0.12–0.20 in) long. Flowering occurs from May to December or January, and the mature cones are 14–35 mm (0.55–1.38 in) long and 10–14 mm (0.39–0.55 in) in diameter containing dark brown to black samaras 5–7 mm (0.20–0.28 in) long. This species is similar to A. verticillata.[3][4][5]

Taxonomy

This species was first formally described in 1848 by Friedrich Anton Wilhelm Miquel who gave it the name Casuarina huegeliana in Lehmann's Plantae Preissianae, from specimens collected on Mount Brown near York in 1840 by Ludwig Preiss.[6][7] It was reclassified in 1982 as Allocasuarina drummondiana by Lawrie Johnson in the Journal of the Adelaide Botanic Gardens.[8] The specific epithet (huegeliana) honours the collector of the type specimens.[9]

Distribution and habitat

Rock sheoak grows near granite in the south-west of Western Australia, where it in native in parts of its range, but naturalised in other places. It occurs from the Murchison River and Mingenew, south to the south coast, and east to near Balladonia, in the Avon Wheatbelt, Coolgardie, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Murchison and Swan Coastal Plain bioregions of Western Australia.[3]

Conservation status

Allocasuarina huegeliana is listed as "not threatened" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions.[3]

Use in horticulture

A. huegeliana is a moderate to fast growing tree that is nitrogen fixing. It can be grown as a windbreak. The species thrives in well-drained soils but will do poorly in saline or poorly drained areas. The attractive and dense wood from the tree is used to make specialty furniture while the foliage is used by grazing stock as fodder. The species is drought and frost tolerant but will be killed by fire. Trees can live up an age of over 15 years.[10]

References

  1. ↑ IUCN SSC Global Tree Specialist Group & Botanic Gardens Conservation International (BGCI) (2020). "Allocasuarina huegeliana". IUCN Red List of Threatened Species. 2020: e.T172665355A172923676. doi:10.2305/IUCN.UK.2020-2.RLTS.T172665355A172923676.en. Retrieved 14 August 2021.
  2. 1 2 "Allocasuarina huegeliana". Australian Plant Census. Retrieved 6 June 2023.
  3. 1 2 3 4 "Allocasuarina huegeliana". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  4. ↑ "Allocasuarina huegeliana". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 6 June 2023.
  5. ↑ "Allocasuarina verticillata". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 6 June 2023.
  6. ↑ "Casuarina huegeliana". APNI. Retrieved 6 June 2023.
  7. ↑ Miquel, Friedrich A.W. (1845). Lehmann, Johann G.C. (ed.). Plantae Preissianae. Vol. 1. Hamburg: Sumptibus Meissneri. p. 640. Retrieved 6 June 2023.
  8. ↑ "Allocasuarina huegeliana". APNI. Retrieved 6 June 2023.
  9. ↑ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 219. ISBN 9780958034180.
  10. ↑ "Allocasuarina huegeliana". Fact Sheet. FloraBank. Retrieved 3 April 2018.
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