Eucalyptus expressa
Encyclopedia
The Wollemi Stringybark is a recently discovered species of Eucalyptus
tree, currently known as Eucalyptus expressa ms. It is likely to be published later in 2011.
Yet to be formally named
, it is a tall forest tree from at least seven populations, in sheltered gullies in the sandstone
ranges north-west of Sydney
. A ROTAP
rarity rating of 2KC has been proposed for this species. Usually seen between 20 and 45 m (65.6 and 147.6 ) tall, it is most closely related to Eucalyptus eugenioides
, and was previously known as E. sp. aff. eugenioides (Bees Nest Ridge).
The specific epithet expressa is from the Latin
expressus, which means “prominent and clearly exhibited”. This refers to the long, narrow and prominently external valves of the gumnuts. Another interesting feature of this plant is the somewhat scalloped or irregularly toothed leaf edges. It occurs in and near Wollemi National Park
and Yengo National Park
. The original specimen was collected beside the Putty Road
.
The trunk is cylindrical and tall, grey brown, with reddish stringybark tinges. Adult leaves are thin and broad-lanceolate in shape, 8 centimetre long by 1.8 centimetre wide on a 8 mm (0.31496062992126 in) leaf stem. Uneven at the base and with an intramarginal leaf vein. The veins at arise at an angle of 30 to 40 degrees to the midrib. The leaf is the same colour green above as below, and the leaf margins are scalloped. The gumnuts measure 7 millimetre on a 2 mm (0.078740157480315 in) stem. Truncate globose or hemispherical, they have 3 or occasionally 4 valves, extending 3 millimetre beyond the rim of the gumnut. There is little information yet available about the flowering of this species.
Eucalyptus
Eucalyptus is a diverse genus of flowering trees in the myrtle family, Myrtaceae. Members of the genus dominate the tree flora of Australia...
tree, currently known as Eucalyptus expressa ms. It is likely to be published later in 2011.
Yet to be formally named
Undescribed taxon
In taxonomy, an undescribed taxon is a taxon that has been discovered, but not yet formally described and named. The various Nomenclature Codes specify the requirements for a new taxon to be validly described and named. Until such a description has been published, the taxon has no formal or...
, it is a tall forest tree from at least seven populations, in sheltered gullies in the sandstone
Narrabeen group
The Narrabeen group of sedimentary rocks occurs in the Sydney Basin in eastern Australia. This series of rocks was formed in the triassic period....
ranges north-west of Sydney
Sydney
Sydney is the most populous city in Australia and the state capital of New South Wales. Sydney is located on Australia's south-east coast of the Tasman Sea. As of June 2010, the greater metropolitan area had an approximate population of 4.6 million people...
. A ROTAP
ROTAP
Rare or Threatened Australian Plants, usually abbreviated to ROTAP, is a list of rare or threatened Australian plant taxa. Developed and maintained by the CSIRO, the most recent edition lists 5031 taxa. The list uses a binary coding system based on the IUCN Red List categories for "Presumed...
rarity rating of 2KC has been proposed for this species. Usually seen between 20 and 45 m (65.6 and 147.6 ) tall, it is most closely related to Eucalyptus eugenioides
Eucalyptus eugenioides
Eucalyptus eugenioides, known as the thin-leaved stringybark, is a common eucalyptus tree in eastern Australia. It grows up to 30 metres tall in grassy forest or dry eucalyptus woodland on deep heavy soils of moderate fertility.-Taxonomy:...
, and was previously known as E. sp. aff. eugenioides (Bees Nest Ridge).
The specific epithet expressa is from the Latin
Latin
Latin is an Italic language originally spoken in Latium and Ancient Rome. It, along with most European languages, is a descendant of the ancient Proto-Indo-European language. Although it is considered a dead language, a number of scholars and members of the Christian clergy speak it fluently, and...
expressus, which means “prominent and clearly exhibited”. This refers to the long, narrow and prominently external valves of the gumnuts. Another interesting feature of this plant is the somewhat scalloped or irregularly toothed leaf edges. It occurs in and near Wollemi National Park
Wollemi National Park
Wollemi National Park is the second largest national park in New South Wales, and contains most of the largest wilderness area, the Wollemi Wilderness...
and Yengo National Park
Yengo National Park
Yengo is a national park in New South Wales, Australia, 132 km northwest of Sydney.In 1993 the National Park and Wildlife Service opened their depot in Bucketty. From here they started to manage the newly established Yengo National Park...
. The original specimen was collected beside the Putty Road
Putty Road
Putty Road is a New South Wales country road linking Windsor, on the fringes of Sydney, to Singleton. It is designated as State Route 69 and is about 150 kilometres long. It is the northern end of State Route 69, connecting with Metroad 9 in Windsor and New England Highway in Singleton...
.
The trunk is cylindrical and tall, grey brown, with reddish stringybark tinges. Adult leaves are thin and broad-lanceolate in shape, 8 centimetre long by 1.8 centimetre wide on a 8 mm (0.31496062992126 in) leaf stem. Uneven at the base and with an intramarginal leaf vein. The veins at arise at an angle of 30 to 40 degrees to the midrib. The leaf is the same colour green above as below, and the leaf margins are scalloped. The gumnuts measure 7 millimetre on a 2 mm (0.078740157480315 in) stem. Truncate globose or hemispherical, they have 3 or occasionally 4 valves, extending 3 millimetre beyond the rim of the gumnut. There is little information yet available about the flowering of this species.