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''Eucalyptus exilis'', commonly known as Boyagin mallee, is a species of mallee that is endemic to Western Australia. It has thin stems with smooth bark, lance-shaped adult leaves, flower buds in groups of eleven, white flowers and barrel-shaped to shortened spherical fruit.
Description
''Eucalyptus exilis'' is a mallee with a whipstick habit, typically grows to a height of and has a lignotuber. The trunk and branches have a covering of smooth, whitish to pale grey over yellow bark that is shed in long thin ribbons. Young plants and coppice regrowth have stems that are square in cross section and sessile, elliptical to egg-shaped leaves that are long and wide. Adult leaves are the same, slightly glossy green on both sides, elliptical to lance-shaped, long and wide on a petiole long. The flower buds are arranged in leafaxil
A leaf ( : leaves) is any of the principal appendages of a vascular plant stem, usually borne laterally aboveground and specialized for photosynthesis. Leaves are collectively called foliage, as in "autumn foliage", while the leaves, st ...
s in groups of eleven on an unbranched peduncle Peduncle may refer to:
*Peduncle (botany), a stalk supporting an inflorescence, which is the part of the shoot of seed plants where flowers are formed
*Peduncle (anatomy), a stem, through which a mass of tissue is attached to a body
**Peduncle (art ...
long, the individual buds on pedicels long. Mature buds are oval to pear-shaped, long and wide with a rounded, sometimes pointed operculum. Flowering occurs between August and October and the flowers are white. The fruit is a woody barrel-shaped to shortened spherical capsule long and wide with the valves enclosed below the level of the rim. The seeds are blackish brown, obliquely pyramidal and long.
Taxonomy
''Eucalyptus exilis'' was first formally described by Ian Brooker and published in the journal '' Nuytsia''. Thespecific epithet
In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...
is taken from the Latin word ''exilis'' meaning ''slender'' in reference to the stems.
Distribution
Boyagin mallee has adisjunct distribution
In biology, a taxon with a disjunct distribution is one that has two or more groups that are related but considerably separated from each other geographically. The causes are varied and might demonstrate either the expansion or contraction of a s ...
in the wheatbelt region of Western Australia where it grows in heathland and shrubland on lateritic
Laterite is both a soil and a rock type rich in iron and aluminium and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of high iron oxide content. They develop b ...
ridges in sandy loamy soils. The three main populations are found near Boyagin Rock
Boyagin Rock is located south west of Brookton and north west of Pingelly in the Wheatbelt region of Western Australia, which is approximately south east of Perth. The Boyagin Rock outcrop rises above the surrounding land and is an cresta ...
, around Bindoon and north east of Mount Lesueur.
Conservation status
This eucalypt is classified as "not threatened" by the Western Australian GovernmentDepartment of Parks and Wildlife
The Department of Parks and Wildlife (DPaW) was the department of the Government of Western Australia responsible for managing lands described in the ''Conservation and Land Management Act 1984'' and implementing the state's conservation and en ...
.
See also
* List of ''Eucalyptus'' speciesReferences
{{Taxonbar, from=Q15396087 Eucalypts of Western Australia exilis Myrtales of Australia Plants described in 1974 Taxa named by Ian Brooker