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York gum
Mallee form of Eucalyptus loxophleba near the Murchison River
Conservation status
Vulnerable  (IUCN 3.1)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Myrtales
Family:	Myrtaceae
Genus:	Eucalyptus
Species:	E. loxophleba
Binomial name
Eucalyptus loxophleba Benth.

Eucalyptus loxophleba, commonly known as York gum, daarwet, goatta, twotta or yandee, is a species of tree or mallee that is endemic to Western Australia. It has rough bark on the trunk, smooth olive to brownish bark above, lance-shaped adult leaves, flowers buds in groups of between seven and eleven, white flowers and conical fruit.

Description

Eucalyptus loxophleba is a mallee or a tree that typically grows to a height of 5 to 15 metres (16 to 49 ft) and forms a lignotuber. The trunk has a diameter of about of 0.6 metres (2 ft) and varying amounts, depending on subspecies, of rough fibrous-flaky or smooth bark on the trunk and smooth grey-brown over copper bark above. Young plants and coppice regrowth have more or less triangular, egg-shaped or almost round glaucous leaves that are 45–100 mm (1.8–3.9 in) long and 35–90 mm (1.4–3.5 in) wide. Adult leaves are lance-shaped to curved, the same glossy, dark green on both sides, 70–155 mm (2.8–6.1 in) long and 10–20 mm (0.39–0.79 in) wide tapering to a petiole 10–25 mm (0.39–0.98 in) long. The flower buds are arranged in leaf axils in groups of seven, nine or eleven on an unbranched peduncle 5–15 mm (0.20–0.59 in) long, the individual buds on pedicels 1–5 mm (0.039–0.197 in) long. Mature buds are oval to pear shaped, 5–8 mm (0.20–0.31 in) long and 3–4 mm (0.12–0.16 in) wide with a rounded operculum. Flowering has been observed in most months and the flowers are white. The fruit is a woody, conical capsule 4–8 mm (0.16–0.31 in) long and 4–6 mm (0.16–0.24 in) wide with the valves below rim level.

Taxonomy and naming

Eucalyptus loxophleba was first formally described in 1867 by George Bentham in Volume 3 of Flora Australiensis.

In 1903 William Fitzgerald changed the name to Eucalyptus foecunda var. loxophleba, but the name is not accepted by the Australian Plant Census.

Hybrids with E. absita and E. wandoo have been recorded.

The specific epithet (loxophleba) is derived from the Greek loxos meaning "cross-wise" and phleps phlebos meaning "a vein". Noongar peoples know the tree as daarwet, goatta, twotta or yandee, the latter is noted as in popular use.

In 1972, Ian Brooker described the subspecies gratiae and loxophleba and in 1992 Lawrie Johnson and Ken Hill described subspecies lissophloia and supralaevis. All four names have been accepted by the Australian Plant Census.

• Eucalyptus loxophleba subsp. gratiae Brooker is a tree with smooth, shining bark and larger leaves, buds and fruit that the autonym, subsp. loxophleba.
• Eucalyptus loxophleba subsp. lissophloia L.A.S.Johnson & K.D.Hill is a mallee with only or mostly only smooth bark.
• Eucalyptus loxophleba subsp. loxophleba Benth. is a tree with rough bark from the trunk to the smaller branches.
• Eucalyptus loxophleba subsp. supralaevis L.A.S.Johnson & K.D.Hill is a tree with rough bark at the base of the trunk and smooth bark on the larger branches and often also the upper trunk.

Distribution and habitat

Woodlands containing E. loxophleba are found across a broad swathe of Western Australia from the Mid West south through the Wheatbelt and east into the Goldfields-Esperance region of the state. It is found among rocky outcrops and on flats, rises, slopes, hilltops, near salt lakes and along drainage lines. The species will grow in a range of soil types such as red-brown or rocky loam, in sands or sandy clays over laterite, dolerite or granite. The tree was recorded as common around the early settlement of York, whence the vernacular "York gum" is derived, and areas near Bolgart, Toodyay, Northam and from Narrogin to Broomehill.

Subspecies gratiae occurs between Dumbleyung and Lake King, subspecies loxophleba from near Moora to Bruce Rock and Chillinup on the Pallinup River, subspecies lissophloia further inland between Bencubbin, Merredin, Lake Minigwal, Coonana and Peak Charles and subspecies supralaevis in more northern areas between the Murchison River, Dongara, Lake Barlee, the Die Hardy Range and Wongan Hills.

Conservation status

This eucalypt is classified as "not threatened" in Western Australia by the Western Australian Government Department of Parks and Wildlife.

Ecology

Hollows in live or dead trees with a diameter at breast height of over 500 mm (20 in) are a known nesting areas for six species of Black cockatoos, two of which are endangered species, including Carnaby's black cockatoo. The birds use these sites, when situated in woodlands or forests, as a breeding habitat. Carnaby's black cockatoos are also known to use the flowers and seeds as a food source and the tree as a roosting site.

Uses

Natural populations of E. loxophleba grow in areas affected by dryland salinity. All four subspecies could possibly be used in the remediation of dryland salinity, but subspecies lissophloia has been more widely cultivated because of its potential as an oil mallee. This subspecies has also been introduced to the eastern States in planting for carbon sequestration. Historically, the wood of subspecies loxophleba was used by wheelwrights and similar workers.

The heartwood of the tree is yellow-brown, hard and tough with an interlocked grain. The wood has a green density of about 1185 kg/m and an air-dried density about 1060 kg/m.

• trunk detail
• cultivated specimen in Jardín Botánico de Barcelona
• mature tree with man at roadside, circa 1920

See also

• List of Eucalyptus species

References

1. Fensham, R.; Laffineur, B.; Collingwood, T. (2019). "Eucalyptus loxophleba". IUCN Red List of Threatened Species. 2019: e.T133380778A133380780. doi:10.2305/IUCN.UK.2019-3.RLTS.T133380778A133380780.en. Retrieved 19 July 2024.
2. ^ "Eucalyptus loxophleba". Australian Plant Census. Retrieved 17 September 2019.
3. ^ "Eucalyptus loxophleba subsp. loxophleba". Euclid: Centre for Australian National Biodiversity Research. Retrieved 1 June 2020.
4. ^ "Eucalyptus loxophleba". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
5. Chippedale, George M. "Eucalyptus loxophleba". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 17 September 2019.
6. "York gum". Forest Products Commission. Retrieved 3 December 2016.
7. ^ "Eucalyptus loxophleba". Florabank. Retrieved 3 December 2016.
8. "Eucalyptus loxophleba". APNI. Retrieved 17 September 2019.
9. Bentham, George (1867). Flora Australiensis. Vol. 3. London: L. Reeve & Co. p. 252.
10. Chippendale, G.M. in George, A.S. (ed.) (1988), Eucalyptus. Flora of Australia 19: 238, 240
11. "Eucalyptus absia × loxophleba". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
12. "Eucalyptus absia × wandoo". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
13. Francis Aubie Sharr (2019). Western Australian Plant Names and their Meanings. Kardinya, Western Australia: Four Gables Press. p. 243. ISBN 9780958034180.
14. "Noongar names for plants". kippleonline.net. Archived from the original on 20 November 2016. Retrieved 3 December 2016.
15. APNI, citing Robson, Peter J. (1993), Checklist of Australian Trees: alphabetical listings of common and scientific names:
16. ^ Brooker, M. Ian H. (1972). "Four new taxa of Eucalyptus from Western Australia". Nuytsia. 1 (3): 248–251. Retrieved 17 September 2019.
17. ^ Hill, Kenneth D.; Johnson, Lawrence A.S. (1992). "Systematic studies in the eucalypts - 5. New taxa and combination in Eucalyptus (Myrtaceae)". Telopea. 4 (4): 565–571. doi:10.7751/telopea19814948.
18. "Eucalyptus loxophleba subsp. gratiae". Australian Plant Census. Retrieved 17 September 2019.
19. "Eucalyptus loxophleba subsp. lissophloia". Australian Plant Census. Retrieved 17 September 2019.
20. "Eucalyptus loxophleba subsp. loxophleba". Australian Plant Census. Retrieved 17 September 2019.
21. "Eucalyptus loxophleba subsp. supralaevis". Australian Plant Census. Retrieved 17 September 2019.
22. "Eucalyptus loxophleba subsp. supralaevis". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
23. ^ Lane-Poole, C. E. (1922). A primer of forestry, with illustrations of the principal forest trees of Western Australia. Perth: F.W. Simpson, government printer. p. 86. doi:10.5962/bhl.title.61019. hdl:2027/uiug.30112041668135. Retrieved 17 September 2019.
24. ^ Kylie Del Fante (12 August 2022). "Habitat Tree and TEC Assessment" (PDF). Del Botanics Environmental Consulting.
25. Saunders, D.A.; Smith, G.T.; Ingram, J.A.; Forrester, Robert (2003). "Changes in a remnant of Salmon Gum Eucalyptus salmonophloia and York Gum E. loxophelba woodland, 1978 to 1997: Implications for woodland conservation in the wheat-sheep regions of Australia". Australian National University. Retrieved 25 April 2023.
26. Christine Groom (15 April 2011). "Plants Used by Carnaby's Black Cockatoo" (PDF). Department of Environment and Conservation. Retrieved 25 April 2023.

• IUCN Red List vulnerable species
• Eucalyptus
• Eucalypts of Western Australia
• Trees of Australia
• Myrtales of Australia
• Taxa named by George Bentham
• Taxa named by Ian Brooker
• Taxa named by Lawrence Alexander Sidney Johnson
• Plants described in 1867