Eucalyptus umbra
Eucalyptus umbra
Eucalyptus umbra is a flowering plant in the myrtle family ( Myrtaceae ). It occurs in the central and northern coastal areas of New South Wales as well as sporadically along the entire east coast of Queensland, where it is "Bastard Mahogany", "White Mahogany", "Bastard White Mahogany", "Broad- leaved White Mahogany", "Yellow Stringybark "or Narrow -leaved White Stringybark " called.
Description
Appearance and leaf
Eucalyptus umbra grows as a tree reaching heights of growth of up to 25 meters, or in the habit of Mallee Eucalyptus, this is a habit that is more shrub-like than tree-like, there are usually multiple strains available that form a Lignotuber. The bark remains on the entire tree is gray to red-brown and fibrous. The bark of young branches is green. Neither in the marrow of the young branches still in the bark, there are oil glands.
In Eucalyptus umbra is available Heterophyllie. The leaves are almost always divided into petiole and leaf blade. Only at seedlings are the first six to twelve pairs of leaves against constantly and sitting. The on top and bottom slightly different colored glossy dark green leaf blade of seedlings is ovoid with a length of 6 to 13 cm and a width of 3 to 7.5 cm. In young specimens the leaf blade is at a length of 10 to 20 cm and a width of 5.5 to 10 cm broad - lanceolate, curved like a sickle and later the shiny green color of leaf surface and underside is very similar to. At middle-aged specimens, the leaf blade is at a length from 13 to 18.5 cm and a width of 3 to 4.5 inches wide - lanceolate, straight, entire and shiny green. The petioles of adult specimens are 13-20 mm long and narrow flattened or channel-shaped. The leaf blades of adult specimens with almost the same color satin finish green upper and bottom sides are at a length of 10 to 14 cm and a width of 2 to 3.5 cm lanceolate, bent relatively thick, crescent-shaped and the upper end may be blunt or pointed. The barely visible lateral nerves go from average distances at an obtuse angle from the midrib. The cotyledons ( cotyledons ) are kidney-shaped.
Inflorescence and flower
Constantly page or apparently terminal at a at a length of 12 to 22 mm in cross section, narrow flattened or angular inflorescence stem stand together seven to eleven flowers in a simple inflorescence. The flower stalks are 5-8 mm long and terete or angular. The non- 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, which remains available until flowering ( anthesis ). The smooth calyptra conical or beaked, shorter than or as long as the smooth flower cup ( hypanthium ) and as wide as this one. The flowers are white or off- white. The flowering period extends from early spring to early summer.
Fruit and seeds
The stalked crop is at a length of 6 to 8 mm and a diameter of 7 to 9 mm to spherical or semi-spherical and spherical short three to fünffächrig. The disc is flat or raised, the fruit trays are at the height of the edge or protrude.
The red-brown seeds is pyramidal or truncated pyramidal. The hilum at the upper end.
Occurrence
The natural range of Eucalyptus umbra is the mittelere and northern coast of New South Wales to Sydney, and north of it, as well as sporadically along the entire east coast of Queensland.
Eucalyptus umbra is locally common in dry sclerophyll forest or woodland area prior to relatively less fertile, flat and dry soils.
System
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, p 687, Plate XLIV. The type material has the caption " Wardell; Dundoon and Tumbulgum (W. Bäuerlen ); Peat 's Ferry, Military Road (R. T. Baker ); Tinonee ( JH Maiden), Gosford (J. Martin); Cowan Creek and Milton (R. H. Cambage ); Eastwood (R. T. Baker ) "on. The specific epithet is derived from the Latin word umbra " umbra " for shade. A synonym of Eucalyptus umbra RTBaker is Eucalyptus umbra RTBaker subsp. umbra.
Occasionally there are natural hybrids of Eucalyptus umbra and Eucalyptus haemastoma and Eucalyptus umbra and Eucalyptus racemosa.
Use
The heartwood of Eucalyptus umbra is light brown and moderately resistant. It has a specific weight of about 925 kg / m³. The wood of Eucalyptus umbra, is used for similar purposes as that of Eucalyptus acmenoides, so for example for the construction of piers and docks, for the manufacture of railway sleepers, flooring and paneling.