Allocasuarina lehmanniana
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Allocasuarina lehmanniana, commonly known as dune sheoak,[1] 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 Template:Cvt long containing winged seeds (samaras) Template:Cvt long.
Description
Allocasuarina lehmanniana is a dioecious, or less commonly a monoecious shrub that typically grows to a height of Template:Cvt. Its branchlets are up to Template:Cvt long (depending on subspecies), the leaves reduced to scale-like teeth Template:Cvt long, arranged in whorls of six to eight around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are mostly Template:Cvt long and Template:Cvt wide. Male flowers are arranged in spikes Template:Cvt long, in whorls of five to eight per centimetre (per 0.39 in.), the anthers Template:Cvt long. Female cones are on a peduncle Template:Cvt long, the mature cones Template:Cvt long and Template:Cvt in diameter containing black samaras Template:Cvt long.[1][2]
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.[3][4] It was reclassified in 1982 as Allocasuarina lehmanniana by Lawrie Johnson in the Journal of the Adelaide Botanic Gardens.[5] The specific epithet (lehmanniana) honours Johann Georg Christian Lehmann.[6]
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[7] has branchlets up to Template:Cvt long, six or seven teeth, the mature cones Template:Cvt long and Template:Cvt in diameter.[8][9]
- Allocasuarina lehmanniana (Miq.) L.A.S.Johnson subsp. lehmanniana[10] has branchlets up to Template:Cvt long, seven or eight teeth, the mature cones Template:Cvt long and Template:Cvt in diameter.[11][12]
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.[1][2] Subspecies ecarinata occurs from near Ongerup to east of Esperance in the Esperance Plains and Mallee bioregions[9][8] 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.[12][11]
Conservation status
Both subspecies of A. lehmanniana are listed as "not threatened" by the Western Australian Government Department of Biodiversity, Conservation and Attractions.[9][12]
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References
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