Eucalyptus umber
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Eucalyptus umber |
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Eucalyptus umbra is a species ofthe myrtle family (Myrtaceae). It occurs on the central and northern coasts of New South Wales and sporadically on the entire east coast of Queensland and becomes "Bastard Mahogany", "White Mahogany", "Bastard White Mahogany", "Broad-leaved White Mahogany", "Yellow" Stringybark ”or“ Narrow-leaved White Stringybark ”.
description
Appearance and leaf
Eucalyptus umbra grows as a tree that reaches heights of up to 25 meters, or in the form of the mallee - eucalyptus , this is a growth form that is more shrub -shaped than tree-shaped , there are usually several trunks that form a lignotuber . The bark remains on the entire tree, is gray to red-brown and fibrous. The bark of the small branches is green. There are no oil glands in the marrow of the young branches or in the bark.
In Eucalyptus umbra , heterophyllia is present. The leaves are almost always divided into a petiole and a leaf blade. Only on seedlings are the first six to twelve pairs of leaves facing and sitting. The leaf blade on seedlings is slightly different in color and shiny on the top and bottom and is egg-shaped with a length of 6 to 13 cm and a width of 3 to 7.5 cm. On young specimens, the leaf blade is 10 to 20 cm long and 5.5 to 10 cm wide, lanceolate, curved sickle-shaped and later the glossy green color of the top and bottom of the leaf is similar. On medium-old specimens, the leaf blade is 13 to 18.5 cm long and 3 to 4.5 cm wide and lanceolate, straight, with entire margins and shiny green. The leaf stalks on adult specimens are 13 to 20 mm long and narrowly flattened or channel-shaped. The leaf blades on adult specimens with almost the same color, silk-matt green upper and lower sides are lanceolate, relatively thick and sickle-shaped, with a length of 10 to 14 cm and a width of 2 to 3.5 cm, and the upper end can be blunt or pointed. The side nerves, which are barely visible, extend from the median nerve at medium distances at an obtuse angle. The cotyledons ( cotyledons ) are kidney-shaped.
Inflorescence and flower
Lateral or apparently terminal on an inflorescence stem with a length of 12 to 22 mm in cross section narrowly flattened or angular inflorescence stem stand together in a simple inflorescence seven to eleven flowers. The flower stalks are 5 to 8 mm long and stalk-round or angular. The not blue-green floured or frosted flower buds are ovoid or spindle-shaped with a length of 7 to 9 mm and a diameter of 3 to 4 mm. The sepals form a calyptra that remains in place until flowering ( anthesis ). The smooth calyptra is conical or beak-shaped, shorter than or as long as the smooth flower cup (hypanthium) and as wide as this. The flowers are white or creamy white. The flowering period extends from spring to early summer.
Fruit and seeds
With a length of 6 to 8 mm and a diameter of 7 to 9 mm, the stalked fruit is hemispherical to spherical or short spherical and three to five facets. The disc is flat or raised, the fruit compartments are level with the rim or protrude.
The red-brown seed is pyramidal or truncated pyramidal. The hilum is at the top.
Occurrence
The natural range of Eucalyptus umbra is the central and northern coastline of New South Wales , around Sydney and north of it, and sporadically all over the east coast of Queensland .
Eucalyptus umbra often occurs locally in dry hard-leaf forests or light forests on relatively less fertile, flat and dry soils .
Systematics
The first description of Eucalyptus umbra was made in 1901 by Richard Thomas Baker in Proceedings of the Linnean Society of New South Wales , Volume 25, page 687, Table XLIV. The type material has the inscription “ Wardell; Dundoon and Tumbulgum (W. Bäuerlen); Peat's Ferry, Military Road (RT Baker); Tinonee (JH Maiden), Gosford (J. Martin); Cowan Creek and Milton (RH Cambage); Eastwood (RT Baker) ”. The specific epithet umbra is derived from the Latin word "umbra" for shadow. A synonym of Eucalyptus umbra R.T.Baker is Eucalyptus umbra R.T.Baker subsp. umbra .
Occasionally there are natural hybrids of Eucalyptus umbra and Eucalyptus haemastoma and of Eucalyptus umbra and Eucalyptus racemosa .
use
The heartwood of Eucalyptus umbra is light brown and moderately persistent. It has a specific weight of around 925 kg / m³. The wood from Eucalyptus umbra is used for similar purposes as that of Eucalyptus acmenoides , for example for the construction of piers and walkways, for the production of railway sleepers, floors and cladding.
Individual evidence
- ↑ a b c Specimen search results: Eucalyptus umbra at Australia's Virtual Herbarium. Council of Heads of Australasian Herbaria . Retrieved April 8, 2013
- ↑ a b c d e APNI = Australian Plant Name Index . Center for Plant Biodiversity Research. Australian Government. Retrieved April 8, 2013
- ↑ a b c d e f g h i j k l m n K. Hill: Eucalyptus umbra RTBaker at New South Wales Flora Online . National Herbarium of NSW, Royal Botanic Garden, Sydney. Retrieved April 8, 2013
- ↑ a b c d e f g h i j k l m n o p q r s t u Eucalyptus umbra at EucaLink - A Web Guide to the Eucalypts . Retrieved April 8, 2013.
- ↑ a b c d e f g h i j k l m n Broad-leaved White Mahogany - Eucalyptus umbra and Eucalyptus carnea in: DJ Boland, MIH Brooker, GM Chippendale, N. Hall, BPM Highland, RD Johnston, DA Kleinig, MW McDonald & JD Turner (Editors): Forest Trees of Australia . CSIRO Publishing. 5th edition 2006. p. 524 at Google Books . Retrieved April 8, 2013
- ↑ Entry in Tropicos . Retrieved April 8, 2013
- ↑ Rafaël Govaerts (ed.): Eucalyptus umbra. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 8, 2013.
- ^ White Mahogany . Department of Agriculture, Fisheries and Forestry. Queensland Government ( Memento of the original from March 8, 2013 in the Internet Archive ) Info: The archive link was automatically inserted and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. . Retrieved April 8, 2013
