Eucalyptus crebra
Eucalyptus crebra
Eucalyptus crebra is a flowering plant within the myrtle family ( Myrtaceae ). It occurs in the eastern third of New South Wales and Queensland, where it is "Grey Ironbark ", "Narrow -leaved Ironbark ", "Narrow -leaved Red Ironbark " or called "Red Ironbark ".
Description
Appearance and leaf
Eucalyptus crebra grows as a tree reaching heights of growth of up to 35 meters. The bark remains on the entire tree is gray -black and along geschrundet. 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 crebra is available Heterophyllie. The leaves are always divided into petiole and leaf blade. The on top and bottom slightly different color green to gray - green leaf blade of seedlings is linear, narrow - lanceolate, lanceolate or broadly lanceolate with a length of 5 to 12.5 cm and a width of 0.4 to 2.5 cm. In young specimens is the same color on top and bottom of dull green to gray - green leaf blade linear with a length of 7 to 12.5 cm and a width of 0.7 to 2.8 cm, narrow - lanceolate, lanceolate or broadly lanceolate. At middle-aged specimens, the leaf blade is at a length of 10 to 17,5 cm and a width of 1.2 to 2.8 cm and linear to narrow - lanceolate, straight, entire, dull and gray-green. The petioles of adult specimens are narrow flattened or channel-shaped with a length of 10 to 15 mm. The top and bottom on the same color dull green or gray - green leaf blades of adult specimens is lanceolate with a length of 6.5 cm to 16 cm and a width of 0.7 to 1.7 cm, relatively thick, curved like a sickle, tapering to Spreitenbasis back and its upper end may be pointed or tapered. The page nerves may be barely visible or sublime and go at close intervals at an acute angle from the midrib from. The cotyledons ( cotyledons ) are wrong - kidney-shaped.
Inflorescence and flower
End or pendant on a 4 to 12 mm long, terete in cross section or angular inflorescence stem are about seven to elfblütige part inflorescences in total composite inflorescences. The flower stalks are 1-6 mm long and terete or angular. The non- blue-green floured or frosted flower buds are egg -, club-, short spindle or diamond -shaped with a length of 3 to 6 mm and a diameter of 2 to 4 mm. The sepals form a calyptra, which drops early. Smooth Calyptra is hemispherical or conical, often bespitzt as long or twice as long as the smooth flower cups ( Hypanthium ) and as wide as the latter. The flowers are white or off- white. The flowering period extends from May to January.
Fruit and seeds
The stalked crop is hemispherical with a length of 3 to 7 mm and a diameter of 3 to 6 mm, oval, cylindrical or disc-shaped and knee three to vierfächrig. The disc is flat or pressed, the fruit or compartments are included at the level of the edge.
The gray - brown seed is ovoid or compressed ovoid. The hilum is centered.
Occurrence
The natural range of Eucalyptus crebra is the eastern third of New South Wales and Queensland, from Picton in the south to Cape York in the north.
Eucalyptus crebra is widespread and common in grassy, clear or dense sclerophyllous forest on moderately fertile, shallow or sandy soils.
System
The first description of Eucalyptus crebra in 1859 by Ferdinand von Mueller, entitled Monograph of the Eucalypti of tropical Australia in the Journal of the Proceedings of the Linnean Society, Botany, Volume 3, page 87 The type material has the caption "A montibus Newcastle Range usque ad sinum Moreton Bay tam solo fertiliore quam steriliore praceipue autem vel montano Collino Sylvas vastas Apertas constituens. Anth. Aestate. "on. The specific epithet is derived from the Latin word crebra " Creber " for common and probably refers to the frequency of occurrence of these in some eucalyptus. Synonyms of Eucalyptus crebra F.Muell. is Eucalyptus macrocarpa var crebra Domin, Eucalyptus racemosa var macrocarpa ( Domin ) Blakely, Eucalyptus elegans ARBean, Eucalyptus drepanophylla F.Muell. ex Benth., Eucalyptus xanthoclada Brooker & ARBean and Metrosideros salicifolia Sol. ex Gaertn.
There are a number of natural hybrids of Eucalyptus crebra for example: Eucalyptus brownii, Eucalyptus caleyi subsp. caleyi, Eucalyptus Coolabah Eucalyptus decorticans, Eucalyptus fibrosa subsp. fibrosa, Eucalyptus fibrosa subsp. nubila, melanophloia Eucalyptus, Eucalyptus microcarpa, Eucalyptus moluccana, Eucalyptus orgadophila, shirleyi Eucalyptus, Eucalyptus thozetiana.
Use
The heartwood of Eucalyptus crebra is reddish brown to dark red and extremely resistant. It has a specific gravity of 890-1200 kg / m³. The wood of Eucalyptus crebra heavy timber is used as for the preparation of piles, railway sleepers, cross struts and floors.
Eucalyptus crebra serves as a shade and avenue tree. It is also cultivated. Also for the production of honey Eucalyptus crebra is important because the flowers contain much nectar and pollen.