Eucalyptus leucoxylon
White rubber eucalyptus
The White gum eucalyptus (Eucalyptus leucoxylon ) is a plant in the myrtle family ( Myrtaceae ). It occurs in western Victoria and southern South Australia, where it is "Yellow Gum", "South Australian Blue Gum " or called "White Ironbark ".
- 4.1 ornamental plant
- 4.2 eucalyptus oil
Description
Appearance and leaf
The white rubber eucalyptus grows as a tree reaching heights of growth of up to 15 meters. The bark is smooth or remains at the lower part of the stem, peeling but otherwise irregularly from. It is gray - brown and fibrous integrally. On the upper parts of the tree, the bark is smooth, gray or yellow and peels off in short bands or patches. Oil glands are available in both the bark and in the marrow.
When White rubber eucalyptus is available Heterophyllie. The leaves are divided into petiole and leaf blade and from 13 nodes ( wound dry ) on opposite sides. The petioles are narrowly flattened or channel-shaped. The leaf blades of young and middle-aged specimens are broad - lanceolate to ovate gray - green or blue-green frosted or floured. The monochrome matt green, gray - green or yellow- green leaf blades of adult specimens are lanceolate or narrow - lanceolate, with a length of 8 to 15 cm and a width of 1.0 to 1.8 cm, tapering towards the base sharpened the upper end. The raised lateral nerves go off at an acute angle from the midrib.
Inflorescence and flower
On a cross-section terete, 7-10 mm long inflorescence stem together are only about three flowers in a simple inflorescence. The stalk round flower stalk is 4-10 mm long. The blue- green frosted or floured flower bud is ovoid with a length of 8 to 14 mm and a diameter of 5 to 6 mm. According to the New South Wales Flora Online the smooth calyptra conical or beaked, shorter and narrower than the smooth flower cup ( hypanthium ), according EucaLink but hemispherical or conical, and once or twice as long as the flower cups and narrower than this. The outer stamens are infertile ( sterile). The flowers are white to cream or pink to red.
Fruit
The fruit is spherical or hemispherical with a length of 8 to 11 mm and a diameter of 8 to 10 mm. The disc is pressed and the fruit trays are included.
Occurrence
The white rubber eucalyptus comes in western Victoria, sporadically on the middle reaches of the Murray River and in the southeast of South Australia before the adjacent New South Wales.
The endangered subspecies Eucalyptus leucoxylon subsp. bellarinensis is endemic on the Bellarine Peninsula southwest of Melbournevor where it is known " Bellarine Yellow Gum".
The white rubber eucalyptus grows in grassy, light forest and preferred moderate nutrient-rich, loamy soils or alluvial soils.
System
The first description of Eucalyptus leucoxylon in 1855 by Ferdinand von Mueller, entitled Description of fifty new Australian plants, chiefly from the colony of Victoria in Transactions and Proceedings of the Victorian Institute for the Advancement of Science, Volume 1, pp. 33-34. The type material has the inscription " In grassy plains from the Avoca to St Vincent's and Spencer 's Gulf ".
From Eucalyptus leucoxylon are seven subspecies:
- Eucalyptus leucoxylon subsp. bellarinensis Rule, syn. Eucalyptus leucoxylon subsp. pruinosa ( F.Muell. ex Miq. ) Boland
- Eucalyptus leucoxylon subsp. connata Rule
- Eucalyptus leucoxylon F.Muell. subsp. leucoxylon, syn. Eucalyptus leucoxylon var erythrostema Miq, Eucalyptus leucoxylon var rostellata Miq, Eucalyptus leucoxylon var rugulosa Miq, Eucalyptus leucoxylon var angulata Benth, Eucalyptus gracilipes Naudin, Eucalyptus leucoxylon var rubra Guilf. .. ..
- Eucalyptus leucoxylon subsp. megolocarpa Boland, syn. Eucalyptus macrocarpa var leucoxylon JEBr.
- Eucalyptus leucoxylon subsp. petiolaris Boland, Eucalyptus petiolaris Rule
- Eucalyptus leucoxylon subsp. pruinosa ( Miq. ) Boland, syn. Eucalyptus pruinosa leucoxylon var F.Muell. . ex Miq. , Eucalyptus leucoxylon var pauperita JEBr.
- Eucalyptus leucoxylon subsp. step haniae Rule
Use
Ornamental plant
The White gum eucalyptus is used in parks and gardens as an ornamental plant. From Eucalyptus leucoxylon there are some varieties. The cultivar ' Rosea' is particularly widespread and shows in the winter a lot of red flowers.
Eucalyptus oil
From the foliage leaves of the white rubber eucalyptus is obtained cineolbasiertems eucalyptus oil.