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''Eucalyptus horistes'' is a species of mallee or small tree that is
endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...
to Western Australia. It has smooth greyish bark, often with rough, firm fibrous bark on the base or all of the trunk, lance-shaped to elliptic adult leaves, flower buds in groups of between seven and thirteen, creamy white flowers and short cylindrical to shortened spherical fruit.


Description

''Eucalyptus horistes'' is a mallee or small tree that typically grows to a height of and forms a
lignotuber A lignotuber is a woody swelling of the root crown possessed by some plants as a protection against destruction of the plant stem, such as by fire. Other woody plants may develop basal burls as a similar survival strategy, often as a response t ...
. It has smooth greyish bark, often with rough, firm fibrous bark on the base or all of the trunk. Young plants and
coppice Coppicing is a traditional method of woodland management which exploits the capacity of many species of trees to put out new shoots from their stump or roots if cut down. In a coppiced wood, which is called a copse, young tree stems are repeated ...
regrowth have
sessile Sessility, or sessile, may refer to: * Sessility (motility), organisms which are not able to move about * Sessility (botany), flowers or leaves that grow directly from the stem or peduncle of a plant * Sessility (medicine), tumors and polyps that ...
, heart-shaped, more or less round or elliptic leaves long and wide. Adult leaves are glossy green, narrow lance-shaped to elliptic, long and wide on a petiole long. The flower buds are arranged in leaf
axil 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 seven, nine, eleven or thirteen on an unbranched peduncle long, the individual buds on
pedicels In botany, a pedicel is a stem that attaches a single flower to the inflorescence. Such inflorescences are described as ''pedicellate''. Description Pedicel refers to a structure connecting a single flower to its inflorescence. In the absenc ...
long. Mature buds are oval to spindle-shaped, long and wide with a beaked operculum. Flowering occurs from November to December or January and the flowers are creamy white. The fruit is a woody, short cylindrical to shortened spherical capsule long and wide with the valves near rim level.Byrne, M., "High genetic identities between three oil mallee taxa, Eucalyptus kochii ssp. kochii, ssp. plenissima and E. horistes, based on nuclear RFLP analysis", ''Heredity'', 1999, 82, pp205–21

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Taxonomy and naming

''Eucalyptus horistes'' was first formally described in 1988 by Lawrence Alexander Sidney Johnson, Lawrie Johnson and Ken Hill from a specimen collected near
Binnu Binnu is a town on the North West Coastal Highway in the Mid West region of Western Australia. The name derives from a well on the outskirts of town that was first in use in 1909. The name is Indigenous Australian in origin and is thought to mea ...
and the description was published in ''
Flora of Australia The flora of Australia comprises a vast assemblage of plant species estimated to over 30,000 vascular and 14,000 non-vascular plants, 250,000 species of fungi and over 3,000 lichens. The flora has strong affinities with the flora of Gondwana, ...
''. The
specific 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 ...
(''horistes'') is an
ancient Greek Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...
word meaning "one who marks boundaries", referring the distribution of this species at the northern limit of the South-west Botanical Province.


Distribution and habitat

This eucalypt grows in mallee shrubland in sandy-loam soils over
laterite 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 by ...
on sand plains, sand dunes and road verges from areas in the
Mid West The Midwestern United States, also referred to as the Midwest or the American Midwest, is one of four Census Bureau Region, census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of ...
, extending through the Wheatbelt and into the Great Southern and Goldfields-Esperance regions of Western Australia.


Conservation status

''Eucalyptus horistes'' is classified as "not threatened" by the Western Australian Government
Department 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 e ...
.


See also

* List of ''Eucalyptus'' species


References

{{Taxonbar, from=Q5405604 horistes Eucalypts of Western Australia Myrtales of Australia Plants described in 1988 Taxa named by Lawrence Alexander Sidney Johnson Taxa named by Ken Hill (botanist)