''Eucalyptus umbrawarrensis'', commonly known as the Umbrawarra gum,
is a small to medium-sized tree that is
endemic
Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to the Northern Territory. It has smooth, powdery white bark, narrow lance-shaped adult leaves, flower buds in groups of seven, white flowers and cup-shaped to barrel-shaped fruit.
Description
''Eucalyptus umbrawarrensis'' is a tree that typically grows to a height of and forms a
lignotuber
A lignotuber is a woody swelling of the root crown possessed by some plants as a protection against destruction of the plant stem, such as by fire. Other woody plants may develop basal burls as a similar survival strategy, often as a response t ...
. It has smooth powdery white bark, that is pale yellow to pale pink when new. Young plants and
coppice
Coppicing is a traditional method of woodland management which exploits the capacity of many species of trees to put out new shoots from their stump or roots if cut down. In a coppiced wood, which is called a copse, young tree stems are repeated ...
regrowth have egg-shaped leaves that are arranged alternately, long and wide. Adult leaves are the same shade of glossy green on both sides, narrow lance-shaped, long and wide, tapering to a
petiole long. The flower buds are arranged in leaf
axil
A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, st ...
s on an unbranched
peduncle long, the individual buds on
pedicels
In botany, a pedicel is a stem that attaches a single flower to the inflorescence. Such inflorescences are described as ''pedicellate''.
Description
Pedicel refers to a structure connecting a single flower to its inflorescence. In the absenc ...
about long. Mature buds are oval to spindle-shaped, long and about wide with a conical to beaked
operculum that is about half as long as the
floral cup
In angiosperms, a hypanthium or floral cup is a structure where basal portions of the calyx, the corolla, and the stamens form a cup-shaped tube. It is sometimes called a floral tube, a term that is also used for corolla tube and calyx tube. It ...
. Flowering has been observed in January and October and the flowers are white. The fruit is a woody cup-shaped to barrel-shaped
capsule long and wide with the valves near rim level.
Taxonomy and naming
''Eucalyptus umbrawarrensis'' was first formally described in 1922 by
Joseph Maiden
Joseph Henry Maiden (25 April 1859 – 16 November 1925) was a botanist who made a major contribution to knowledge of the Australian flora, especially the genus ''Eucalyptus''. This botanist is denoted by the author abbreviation when citing ...
in his book, ''A Critical Revision of the Genus Eucalyptus'' from specimens collected by
Harald Jensen
Harald Jensen (born 18 December 1966) is a Norway, Norwegian sport shooter competing in Olympic skeet, Skeet. Jensen won the gold medal at both the 2002 ISSF World Shooting Championships, ISSF World Shooting Championships and the ...
in 1916 in Umbrawarra Gorge.
The
specific epithet
In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
(''umbrawarrensis'') refers to the
type location.
Distribution and habitat
Umbrawarra gum grows in open woodland on ridges, hills and tablelands in the
Top End
The Top End of Australia's Northern Territory is a geographical region encompassing the northernmost section of the Northern Territory, which aside from the Cape York Peninsula is the northernmost part of the Australian continent. It covers a ra ...
and
Victoria River districts of the Northern Territory.
Conservation status
This eucalypt is classified as "least concern" under the Northern Territory Government ''
Territory Parks and Wildlife Conservation Act.
See also
*
List of ''Eucalyptus'' species
References
{{Taxonbar, from=Q15356472
Trees of Australia
umbrawarrensis
Myrtales of Australia
Flora of the Northern Territory
Plants described in 1922