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''Eucalyptus helidonica'' is a species of tree that is endemic to an area near Helidon in Queensland. It has rough, finely fibrous bark, lance-shaped or curved adult leaves that are paler on the lower surface, flower buds in groups of eleven or more, white flowers and shortened spherical or barrel-shaped fruit.
''Eucalyptus helidonica'' is a species of tree that is endemic to an area near Helidon in Queensland. It has rough, finely fibrous bark, lance-shaped or curved adult leaves that are paler on the lower surface, flower buds in groups of eleven or more, white flowers and shortened spherical or barrel-shaped fruit.
Description
''Eucalyptus helidonica'' typically grows to a height of around and forms a lignotuber. It has rough grey or grey-brown bark and finely fibrous bark over the trunk and the larger branches, smooth on the smaller branches. Young plants and coppice regrowth have sessile, linear to narrow lance-shaped leaves that are arranged in opposite pairs and paler on the lower surface. The juvenile leaves are long and wide. Adult leaves are lance-shaped or curved and dull green but paler on the lower surface, long and wide, tapering evenly to a petiole long. The flower buds are arranged in leafaxil
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 in groups of eleven or more on an unbranched peduncle Peduncle may refer to:
*Peduncle (botany), a stalk supporting an inflorescence, which is the part of the shoot of seed plants where flowers are formed
*Peduncle (anatomy), a stem, through which a mass of tissue is attached to a body
**Peduncle (art ...
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 ...
long. Mature buds are oval, long and about wide with a conical operculum. The flowers are white and the fruit is a woody shortened spherical to barrel-shaped capsule long and wide, with the valves near rim level or enclosed below it.
Taxonomy
''Eucalyptus helidonica'' was first formally described by the botanist Kenneth Hill in 1999 in the journal '' Telopea''. Thespecific 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 ...
''helidonica'' refers to the town in the centre of this species' distribution.
''Eucalyptus helidonica'' is part of the white mahogany group as recognised by Ken Hill. Others in the group include '' E. acmenoides'', '' E. mediocris'', '' E. carnea'', '' E. apothalassica'', '' E. latisinensis'', '' E. psammitica'' and '' E. umbra''.
Distribution
This stringybark is endemic to a small area surrounding the town of Helidon to the west of Brisbane amongst theGreat Dividing Range
The Great Dividing Range, also known as the East Australian Cordillera or the Eastern Highlands, is a cordillera system in eastern Australia consisting of an expansive collection of mountain ranges, plateaus and rolling hills, that runs rough ...
. It is found as a part of dry sclerophyll woodland communities where it is found on sandstone ridges and slopes growing in sandy soils.
Conservation status
This eucalypt is classified as "least concern" under the Queensland Government '' Nature Conservation Act 1992''.See also
* List of ''Eucalyptus'' speciesReferences
{{Taxonbar, from=Q15398279 Trees of Australia helidonica Myrtales of Australia Flora of Queensland Plants described in 1999