Allocasuarina lehmanniana

Allocasuarina lehmanniana
Branchlets and immature female cones of subsp. ecarinata
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fagales
Family: Casuarinaceae
Genus: Allocasuarina
Species:
A. lehmanniana
Binomial name
Allocasuarina lehmanniana
Occurrence data from AVH
Synonyms[1]

Casuarina lehmanniana Miq.

Allocasuarina lehmanniana, commonly known as dune sheoak,[2] is a species of flowering plant in the family Casuarinaceae and is endemic to near-coastal areas of the south-west of Western Australia. It is dioecious or less commonly a monoecious shrub that has its leaves reduced to scales in whorls of six to eight, the mature fruiting cones 12–35 mm (0.47–1.38 in) long containing winged seeds (samaras) 4.0–5.5 mm (0.16–0.22 in) long.

Description

Allocasuarina lehmanniana is a dioecious, or less commonly a monoecious shrub that typically grows to a height of 1.5–4 m (4 ft 11 in – 13 ft 1 in). Its branchlets are up to 120–200 mm (4.7–7.9 in) long (depending on subspecies), the leaves reduced to scale-like teeth 0.4–0.8 mm (0.016–0.031 in) long, arranged in whorls of six to eight around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are mostly 5–9 mm (0.20–0.35 in) long and 0.7–1.2 mm (0.028–0.047 in) wide. Male flowers are arranged in spikes 10–30 mm (0.39–1.18 in) long, in whorls of five to eight per centimetre (per 0.39 in.), the anthers 0.6–0.9 mm (0.024–0.035 in) long. Female cones are on a peduncle 2–38 mm (0.079–1.496 in) long, the mature cones 12–35 mm (0.47–1.38 in) long and 7–12 mm (0.28–0.47 in) in diameter containing black samaras 4.0–5.5 mm (0.16–0.22 in) long.[2][3]

Taxonomy

Dune sheoak was first formally described in 1845 by Friedrich Anton Wilhelm Miquel who gave it the name Casuarina lehmanniana in Lehmann's Plantae Preissianae from specimens collected by Ludwig Preiss in 1840.[4][5] It was reclassified in 1982 as Allocasuarina lehmanniana by Lawrie Johnson in the Journal of the Adelaide Botanic Gardens.[6] The specific epithet (lehmanniana) honours Johann Georg Christian Lehmann.[7]

In 1989, Johnson described two subspecies of Allocasuarina lehmanniana in the Flora of Australia and the names are accepted by the Australian Plant Census:

  • Allocasuarina lehmanniana subsp. ecarinata L.A.S.Johnson[8] has branchlets up to 120 mm (4.7 in) long, six or seven teeth, the mature cones 12–24 mm (0.47–0.94 in) long and 7–11 mm (0.28–0.43 in) in diameter.[9][10]
  • Allocasuarina lehmanniana (Miq.) L.A.S.Johnson subsp. lehmanniana[11] has branchlets up to 200 mm (7.9 in) long, seven or eight teeth, the mature cones 13–35 mm (0.51–1.38 in) long and 9–12 mm (0.35–0.47 in) in diameter.[12][13]

Distribution and habitat

Allocasuarina lehmanniana grows in winter-wet places in near-coastal areas from Jurien Bay to near Albany and east to Ravensthorpe in the Avon Wheatbelt, Carnarvon, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Swan Coastal Plain and Warren bioregions of south-western Western Australia.[2][3] Subspecies ecarinata occurs from near Ongerup to east of Esperance in the Esperance Plains and Mallee bioregions[10][9] and subsp. lehmanniana between Jurien Bay to east of Albany in the Avon Wheatbelt, Esperance Plains, Geraldton Sandplains, Jarrah Forest, Mallee, Swan Coastal Plain and Warren bioregions.[13][12]

Conservation status

Both subspecies of A. lehmanniana are listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.[10][13]

  • Mature cone
    Mature cone

References

  1. ^ a b "Allocasuarina lehmanniana". Australian Plant Census. Retrieved 14 June 2023.
  2. ^ a b c "Allocasuarina lehmanniana". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. ^ a b "Allocasuarina lehmanniana". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 14 June 2023.
  4. ^ "Casuarina lehmanniana". APNI. Retrieved 14 June 2023.
  5. ^ Miquel, Friedrich A.W. (1845). Lehmann, Johann G.C. (ed.). Plantae Preissianae. Vol. 1. Hamburg: Sumptibus Meissneri. p. 639. Retrieved 14 June 2023.
  6. ^ "Allocasuarina lehmanniana". APNI. Retrieved 14 June 2023.
  7. ^ Sharr, Francis Aubi; George, Alex (2019). Western Australian Plant Names and Their Meanings (3rd ed.). Kardinya, WA: Four Gables Press. p. 237. ISBN 9780958034180.
  8. ^ "Allocasuarina lehmanniana subsp. ecarinata". Australian Plant Census. Retrieved 14 June 2023.
  9. ^ a b "Allocasuarina lehmanniana subsp. ecarinata". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 14 June 2023.
  10. ^ a b c "Allocasuarina lehmanniana subsp. ecarinata". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  11. ^ "Allocasuarina lehmanniana subsp. lehmanniana". Australian Plant Census. Retrieved 14 June 2023.
  12. ^ a b "Allocasuarina lehmanniana subsp. lehmanniana". Australian Biological Resources Study, Department of Agriculture, Water and the Environment: Canberra. Retrieved 14 June 2023.
  13. ^ a b c "Allocasuarina lehmanniana subsp. lehmanniana". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.

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