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''Eucalyptus johnsoniana'', commonly known as Johnson's mallee, is a species of mallee 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 brown bark, sometimes with flaky to fibrous brownish bark at the base, lance-shaped adult leaves, flower buds in groups of seven, creamy white flowers and shortened spherical fruit with an unusually small opening.
Description
''Eucalyptus johnsoniana'' is a mallee that typically grows to a height of and forms a lignotuber. It has smooth greyish brown bark, sometimes with rough, flaky to fibrous bark on the lower part of the trunk. Young plants and coppice regrowth have dull bluish green, egg-shaped to elliptic leaves that are long and wide. Adult leaves are lance-shaped, long and wide on a petiole long. The flower buds are arranged in leaf axils in groups of seven on apeduncle 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
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 pear-shaped, long and wide with a rounded operculum. Flowering occurs from July to August or from October to January and the flowers are creamy white. The fruit is a woody, shortened spherical capsule with an unusually small opening.
Taxonomy and naming
''Eucalyptus johnsoniana'' was first formally described in 1978 by Ian Brooker and Donald Blaxell from a specimen Blaxell collected near theBrand Highway
Brand Highway is a main highway linking the northern outskirts of Perth to Geraldton in Western Australia. Together with North West Coastal Highway, it forms part of the Western Australian coastal link to the Northern Territory. The highway i ...
in 1975. 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 ...
honours "Dr. Lawrie Johnson, Director of the Royal Botanic Garden, Sydney
The Royal Botanic Garden, Sydney is a heritage-listed major botanical garden, event venue and public recreation area located at Farm Cove on the eastern fringe of the Sydney central business district, in the City of Sydney local government a ...
".
Distribution and habitat
Johnson's mallee grow in heath, mostly on undulating sandplain between Eneabba and Badgingarra.Conservation status
This mallee is listed as "vulnerable" under the Australian Government Environment Protection and Biodiversity Conservation Act 1999 and as " Threatened Flora (Declared Rare Flora — Extant)" by the Department of Environment and Conservation (Western Australia). The current population size is estimated to be 360 plants. The main threats to the species are fire, land clearing and transmission line maintenance.See also
* List of ''Eucalyptus'' speciesReferences
{{Taxonbar, from=Q15398178 Eucalypts of Western Australia johnsoniana Myrtales of Australia Plants described in 1978 Taxa named by Ian Brooker