Eucalyptus quaerenda
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| ( LASJohnson & KDHill ) Byrne |
Eucalyptus quaerenda is a species ofthe myrtle family (Myrtaceae). It occurs in southwestern Western Australia .
description
Appearance and leaf
Eucalyptus quaerenda grows 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 ; stature heights of usually 1 to 4 meters are reached. The bark is smooth and spotted on the entire specimen, light gray, light brown, pinkish-gray or whitish. There are sometimes ligaments on the lower parts of the trunk. The small branches have no oil glands in the pith . Young specimens have round trunks in cross-section.
In Eucalyptus quaerenda is Heterophyllie ago. The leaves are always arranged alternately. The most short-stalked leaves on young specimens have a 4.5 to 8 cm long and 0.3 to 0.6 cm wide leaf blade. The lowest youth leaves are dull bluish green and the upper ones are glossy green. The leaf stalk on adult specimens is 2 to 5 mm long. The leaf blades on adult specimens are initially dull blue-green, later glossy green, of the same color on the upper and lower sides, are upright, with a length of 2.5 to 9.0 cm and a width of 0.4 to 0.7 cm linear, with entire margins, with a tapering base of the blade and a pointed upper end. The side nerves, which are barely visible, extend from the median nerve at an obtuse angle at small to medium distances. Oil glands are more or less rounded in the intercostal fields.
Inflorescence and flower
The simple, dold-like inflorescence , standing on the side over a 1 to 6 mm long inflorescence stem, contains about seven flowers.
The stalked flowers are hermaphroditic, radial symmetry with a double flower envelope . The flower buds are egg-shaped. The sepals form a rounded to conical "calyptra" or "operculum" . The flowers are creamy white. The many stamens are bent inwards in the flower bud. The dorsifixen 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 or more or less sessile fruit is 5 to 7, rarely up to 8 mm wide and flat, cup-shaped to inverted-conical or flattened, spherical and often swollen below the edge at the level of the disc. The disc is usually flat or sometimes crooked. The three fruit compartments are 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 quaerenda is only in Western Australia , mainly in the independent administrative areas Kent , Kojonup , Lake Grace and Ravensthorpe in the regions Goldfields-Esperance , Great Southern and Wheatbelt .
In Western Australia, Eucalyptus quaerenda thrives on white sand , loam or sometimes salty soils , often on plains or on sand hills.
Taxonomy
It was first described in 1992 by Lawrence Alexander Sidney Johnson and Kenneth D. Hill under the name ( Basionym ) Eucalyptus angustissima subsp. quaerenda LAS Johnson & KDHill in the article Systematic studies in the eucalypts -5. New taxa and combinations in Eucalyptus (Myrtaceae) in Western Australia in Telopea , Volume 4, Issue 4, p. 597 as a subspecies of Eucalyptus angustissima . The type material has the inscription “WESTERN AUSTRALIA: 100 meters S of the south shore of Lake Chinocup. KD Hill 2460, LAS Johnson & DF Blaxell, Nov. 13, 1986 (holo NSW, iso CANB, CBG, MEL, PERTH.) ” . Margaret Mary Byrne gave her the rank of a species Eucalyptus quaerenda (LASJohnson & KDHill) Byrne in 2004 under the title Recognition of Eucalyptus quaerenda (Myrtaceae) at specific rank in Nuytsia , Volume 15, Issue 2, pp. 321-323, Fig. 1. The specific epithet quaerenda is derived from the Latin word quaerendus for “must be sought” and refers to the early attempts to find this plant species.
Individual evidence
- ↑ Specimen search results: Eucalyptus quaerenda at Australia's Virtual Herbarium. Council of Heads of Australasian Herbaria . Retrieved March 4, 2013
- ↑ a b c Eucalyptus quaerenda in the Western Australian Flora . Retrieved March 4, 2013
- ↑ a b c d e f g h Eucalyptus angustissima subsp. quaeranda at EUCLID: Eucalypts of Southern Australia by MIH Brooker, AV Slee & JR Connors. Retrieved March 4, 2013
- ↑ a b APNI = Australian Plant Name Index . Center for Plant Biodiversity Research. Australian Government. Retrieved March 4, 2013
- ↑ Eucalyptus quaerenda at Tropicos.org. Missouri Botanical Garden, St. Louis, accessed March 4, 2013.
- ↑ Rafaël Govaerts (ed.): Eucalyptus quaerenda. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved March 4, 2013.