''Eucalyptus dalrympleana'', commonly known as mountain gum, mountain white gum, white gum and broad-leaved ribbon gum, is a species of 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 southeastern Australia. It has smooth bark, lance-shaped adult leaves, flower buds in groups of three or seven, white flowers and cup-shaped, bell-shaped or hemispherical fruit. Myrtales - Eucalyptus dalrympleana 12

Description

''Eucalyptus dalrympleana'' is a 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 white to yellowish bark, sometimes with a short stocking of rough bark. 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 leaves arranged in opposite pairs and are egg-shaped or heart-shaped to more or less round, long and wide. Adult leaves are arranged alternately, lance-shaped to curved, the same colour on both sides, long and wide on a petiole long. The flower buds are arranged in groups of three or 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 peduncle long, the individual buds

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 ...

or on a

pedicel Pedicle or pedicel may refer to: Human anatomy *Pedicle of vertebral arch, the segment between the transverse process and the vertebral body, and is often used as a radiographic marker and entry point in vertebroplasty and kyphoplasty procedures ...

up to long. Mature buds are oval, green to yellow, long and wide with a conical to rounded operculum. Flowering mainly occurs between March and June and the flowers are white. The fruit is a woody cup-shaped, bell-shaped or hemispherical capsule long and wide.

Taxonomy and naming

''Eucalyptus dalrympleana'' was first formally described in 1920 by

Joseph Maiden Joseph Henry Maiden (25 April 1859 – 16 November 1925) was a botanist who made a major contribution to knowledge of the Australian flora, especially the genus ''Eucalyptus''. This botanist is denoted by the author abbreviation when citing ...

from a specimen collected by Wilfred de Beuzeville near Yarrangobilly. The description was published in Maiden's book, ''The Forest Flora of New South Wales''. 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 ...

(''dalrympleana'') honours the forester, Richard Dalrymple Hay. In 1962,

Lawrie Johnson Lawrence Alexander Sidney Johnson Fellow of the Australian Academy of Science, FAA, (26 June 1925 – 1 August 1997) known as Lawrie Johnson, was an Australian Taxonomy (biology), taxonomic botany, botanist. He worked at the Royal Botanic Garden ...

described two subspecies and the names have been accepted by the

Australian Plant Census The Australian Plant Census (APC) provides an online interface to currently accepted, published, scientific names of the vascular flora of Australia, as one of the output interfaces of the national government Integrated Biodiversity Information Syst ...

: * ''Eucalyptus dalrympleana'' Maiden subsp. ''dalrympleana'' has flower buds arranged in groups of three; * ''Eucalyptus dalrympleana'' subsp. ''heptantha'' L.A.S.Johnson has flower buds and flowers in groups of seven.

Distribution and habitat

Mountain gum grows in woodland and forest at higher elevations in far south-eastern

Queensland ) , nickname = Sunshine State , image_map = Queensland in Australia.svg , map_caption = Location of Queensland in Australia , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , established_ ...

New South Wales ) , nickname = , image_map = New South Wales in Australia.svg , map_caption = Location of New South Wales in AustraliaCoordinates: , subdivision_type = Country , subdivision_name = Australia , established_title = Before federation , es ...

Victoria Victoria most commonly refers to: * Victoria (Australia), a state of the Commonwealth of Australia * Victoria, British Columbia, provincial capital of British Columbia, Canada * Victoria (mythology), Roman goddess of Victory * Victoria, Seychelle ...

South Australia South Australia (commonly abbreviated as SA) is a state in the southern central part of Australia. It covers some of the most arid parts of the country. With a total land area of , it is the fourth-largest of Australia's states and territories ...

and

Tasmania ) , nickname = , image_map = Tasmania in Australia.svg , map_caption = Location of Tasmania in AustraliaCoordinates: , subdivision_type = Country , subdi ...

. Subspecies ''heptantha'' is only found in far south-eastern Queensland and on the

northern tablelands The Northern Tablelands, also known as the New England Tableland, is a plateau and a region of the Great Dividing Range in northern New South Wales, Australia. It includes the New England Range, the narrow highlands area of the New England regio ...

of New South Wales. Subspecies ''dalrympleana'' occurs south from the

central Central is an adjective usually referring to being in the center of some place or (mathematical) object. Central may also refer to: Directions and generalised locations * Central Africa, a region in the centre of Africa continent, also known as ...

and southern tablelands of New South Wales. The species is rare in South Australia where it only occurs in the

Mount Lofty Ranges The Mount Lofty Ranges are a range of mountains in the Australian state of South Australia which for a small part of its length borders the east of Adelaide. The part of the range in the vicinity of Adelaide is called the Adelaide Hills and ...

Use in horticulture

In cultivation in the UK, ''E. dalrympleana'' is fully hardy down to but prefers some shelter. It grows best in full sun. It has gained the

Royal Horticultural Society The Royal Horticultural Society (RHS), founded in 1804 as the Horticultural Society of London, is the UK's leading gardening charity. The RHS promotes horticulture through its five gardens at Wisley (Surrey), Hyde Hall (Essex), Harlow Carr (Nort ...

Award of Garden Merit The Award of Garden Merit (AGM) is a long-established annual award for plants by the British Royal Horticultural Society (RHS). It is based on assessment of the plants' performance under UK growing conditions. History The Award of Garden Merit ...

References

* Holliday, I. ''A field guide to Australian trees (3rd edition)'', Reed New Holland, 2002 {{Taxonbar, from=Q159839 dalrympleana Myrtales of Australia Flora of the Australian Capital Territory Flora of New South Wales Flora of Queensland Flora of South Australia Flora of Tasmania Flora of Victoria (Australia) Plants described in 1920 Taxa named by Joseph Maiden Trees of Australia