Eucalyptus angustissima
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Eucalyptus angustissima |
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Eucalyptus angustissima is a species ofthe myrtle family (Myrtaceae). It originally comes from southern Western Australia and is called "Narrow leaved Mallee" there.
description
Appearance
Eucalyptus angustissima grows in the form of the mallee - eucalyptus , this is a growth form that is more shrub -like than tree-shaped , there are usually several trunks that form a lignotuber ; stature heights of usually 1 to 4 meters, rarely up to 8 meters, are reached. Lignotuber are woody bulges that form at the base of the trunk and have "sleeping eyes"; this is an adaptation to bush fires , where the wood can sprout again. The light gray, light brown, orange and whitish spotted bark is smooth on the whole trunk and has no glands; there are sometimes ligaments. There are no oil glands in the pith of the branches. Young specimens have round trunks in cross-section.
leaf
In Eucalyptus angustissima , heterophyllia is present. The leaves, which are always arranged alternately on the branches, are at most short (up to 2 mm) stalked.
The leaves on young specimens are 4.5 to 8 cm long and 0.3 to 0.4 cm wide, elliptical to ovate, straight and with entire margins. The lowest youth leaves are dull bluish green and the upper ones are glossy green.
The upright, glossy or dull, evenly green colored and relatively thin leaves on adult specimens are (rarely 5.5 to) 7 to 11.5 cm long and 0.15 to 0.3 wide (rarely up to to 0.4) cm linear to narrowly lanceolate, sickle-shaped with a tapering base of the blade and a pointed or pointed upper end, as well as a smooth edge. Only the median nerve is raised, the lateral and network nerves are hardly recognizable. Dried leaves look furrowed. Oil glands are clearly or hardly noticeable in the intercostal fields .
Inflorescence and flower
In Western Australia, the flowering period extends from August to December or January. The lateral inflorescence is simple, as well as umbellate, and contains three to seven flowers. The 0.2 to 0.4 cm long inflorescence stem has a diameter of about 3 mm and a narrow, flattened or angular cross-section.
The stalked flowers are hermaphrodite, radial symmetry and four-fold with a double flower envelope . The egg-shaped flower buds are not floured or frosted. The sepals form an early sloping, bald “calyptrata” or “operculum” , which is spherical to conical, two to three times as long as the flower cup and is also shallower than this. The flower cup (hypanthium) is bare. The flowers are white or cream in color. The many stamens are bent inwards in the flower bud. The elongated to kidney-shaped dust bag öffenen with a short lateral slot. Three carpels have grown together to form a three- chamber ovary. Each placenta has four rows of ovules . The long, straight stylus ends in a more or less blunt scar.
Fruit and seeds
The stalked fruit is 0.5 to 0.8 cm wide and flat, cup-shaped to distinctly or flat spherical and swollen below the edge at the level of the disc and three fruit fans at the level of the edge. The tan-colored seeds are 1.0 to 2.5 mm in length, flattened, ovate with a more or less smooth top, sometimes a slightly furrowed surface and a hilum on the underside.
Occurrence
The natural range of Eucalyptus angustissima is only in Western Australia , mainly in the parishes of Esperance and Woodanilling .
In Western Australia, Eucalyptus angustissima thrives on white or gray sand, clay soils, loam or sometimes salty soils , often on salt flats, on salt pans or on sand hills.
Systematics
The first description of Eucalyptus angustissima was made in 1862 by Ferdinand von Mueller in Fragmenta Phytographiae Australiae , Volume 3 (18) 25. The type material has the caption: "Inter Promontoria Point Malcolm et Point Dover. Mxw. “ On; so it was collected in Western Australia, between Point Maxwell and Point Dover. The specific epithet angustissima is the enhancement of the Latin word angustus for narrow and refers to the leaves, which are the narrowest of all older eucalyptus.
So far there have been two subspecies, but Eucalyptus angustissima subsp. quaerenda L.ASJohnson & KDHill received from Margaret Byrne in Recognition of Eucalyptus quaerenda (Myrtaceae) at specific rank. In: Nuytsia , Volume 15, 2004, p. 321 the rank of a species Eucalyptus quaerenda (LASJohnson & KDHill) Byrne .
Eucalyptus angustissima belongs to the series Angustissimae of the subsection Destitutae from the section Bisectae in the subgenus Symphyomyrtus within the genus Eucalyptus . Common to this family group are the Y-shaped cotyledons ( cotyledons ) and the lack of oil glands in the pith of the branches.
Individual evidence
- ↑ a b Entry in Australian Plant Name Index = APNI . Retrieved January 9, 2013.
- ↑ a b c d e f g h i j k l Eucalyptus angustissima at EucaLink - A Web Guide to the Eucalypts . Retrieved January 9, 2013.
- ↑ a b c d e Eucalyptus angustissima in the Western Australian Flora . Retrieved January 9, 2013.
- ↑ a b c d e f g h i j k l m n o p q r s t Eucalyptus angustissima subsp. angustissima at EUCLID: Eucalypts of Southern Australia by MIH Brooker, AV Slee & JR Connors . Retrieved January 9, 2013.
- ↑ First publication scanned at biodiversitylibrary.org .
- ↑ Entry in Tropicos . Retrieved January 9, 2013.
- ↑ Rafaël Govaerts (ed.): Eucalyptus angustissima. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved January 9, 2013.
