''Eucalyptus dunnii'', commonly known as Dunn's white gum or simply white gum, is a species of medium-sized to tall tree that is endemic to eastern Australia. It has rough bark near the base, smooth white to cream-coloured bark above, lance-shaped to curved adult leaves, flower buds in groups of seven, white flowers and cup-shaped, conical or hemispherical fruit. Eucalyptus dunnii buds

Description

''Eucalyptus dunnii'' is a tree that typically grows to a height of and forms a lignotuber. It has rough, greyish, corky, fibrous or flaky bark on the lower part of the trunk, smooth white or grey bark above that is shed in short ribbons. Young plants and coppice regrowth have egg-shaped to elliptical or almost round leaves that are long and wide, arranged in opposite pairs. Adult leaves are arranged alternately, lance-shaped to curved, the same glossy green on both sides, long and wide on a petiole wide. The flower buds are arranged in groups of seven 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 on a flattened, 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 a pedicel long. Mature buds are oval, long and wide with a beaked, conical or rounded operculum. The flowers are white and the fruit is a woody cup-shaped, conical or hemispherical capsule long and wide with the valves reaching past the level of the rim.

Taxonomy and naming

''Eucalyptus dunnii'' was first described in 1905 by Joseph Maiden in ''

Proceedings of the Linnean Society of New South Wales The Linnean Society of New South Wales promotes ''the Cultivation and Study of the Science of Natural History in all its Branches'' and was founded in Sydney, New South Wales (Australia) in 1874 and incorporated in 1884. History The Society succ ...

'' from a specimen collected by William Dunn at "Acacia Creek, Macpherson Range". 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 ...

(''dunnii'') honours the collector of the

type Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS command), a command to display contents of a file. * Ty ...

specimen.

Distribution and habitat

Dunn's white gum has a scattered and restricted distribution in wet forest north from Dorrigo and

Coffs Harbour Coffs Harbour is a city on the Mid North Coast of New South Wales, Australia, north of Sydney, and south of Brisbane. It is one of the largest urban centres on the North Coast, with a population of 78,759 as per 2021 census. The Gumbaynggirr ...

in New South Wales to Warwick and Canungra in Queensland.

References

{{Taxonbar, from=Q15397208 dunnii Myrtales of Australia Flora of New South Wales Trees of Australia Plants described in 1905 Taxa named by Joseph Maiden