Fine Art

Eucalyptus tereticornis

Eucalyptus tereticornis, Germasogeia (Yermasoyia), Cyprus, Photo:  Augusta Stylianou Artist

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids II
Ordo: Myrtales

Familia: Myrtaceae
Subfamilia: Myrtoideae
Tribus: Eucalypteae
Genus: Eucalyptus
Subgenus: E. subg. Symphyomyrtus
Sectio: E. sect. Exsertaria
Series: E. ser. Erythroxylon
Species: Eucalyptus tereticornis
Subspecies: E. t. subsp. basaltica – E. t. subsp. rotunda – E. t. subsp. mediana – E. t. subsp. tereticornis

Eucalyptus tereticornis Sm., Spec. Bot. New Holland 4: 41–42 (1795)

Typus: J. White s.n. ([1793]; Holotypus: LINN [cf. -HS 876.21.(JSTOR)]; Isotypus: BM [​BM001015287(JSTOR)]).
Type locality: [Australia. New South Wales: Port Jackson.]

Native distribution areas:

Continental: Asia-Tropical
Regional: Papuasia
New Guinea (Papua New Guinea)
Continental: Australasia
Regional: Australia
New South Wales, Queensland, Victoria

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Smith, J.E. 1793-1795. A specimen of the botany of New Holland. Published and illustrated by James Sowerby. Reference page.

Additional references

Chippendale, G.M. 1988. Eucalyptus. In: Flora of Australia 19: 1–448; 495–507 (Appendix). AGPS. Online. Reference page. [see page 324.]


IUCN: Eucalyptus tereticornis Sm. (Least Concern) - Assessed by R. Fensham, B. Laffineur & T. Collingwood on 4 March 2019.
Slee, A.V., Brooker, M.I.H., Duffy, S.M. & West, J.G. 2020. Eucalyptus_tereticornis_subsp._tereticornis. EUCLID: Eucalypts of Australia. Fourth Edition. Accessed: 2022 September 17
Govaerts, R. et al. 2022. Eucalyptus tereticornis in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2022 September 17. Reference page.
International Plant Names Index. 2022. Eucalyptus tereticornis. Published online. Accessed: 17 September 2022.
USDA, ARS, Germplasm Resources Information Network. Eucalyptus tereticornis in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: Forest Red Gum

Eucalyptus tereticornis, commonly known as forest red gum, blue gum or red irongum,[3] is a species of tree that is native to eastern Australia and southern New Guinea. It has smooth bark, lance-shaped to curved adult leaves, flower buds in groups of seven, nine or eleven, white flowers and hemispherical fruit.


Eucalyptus tereticornis is a tree that typically grows to a height of 20–50 m (66–164 ft) and forms a lignotuber. The trunk is straight, usually unbranched for more than half of the total height of the tree and has a girth of up to 2 m (6 ft 7 in) dbh. Thereafter, limbs are unusually steeply inclined for a Eucalyptus species. The bark is shed in irregular sheets, resulting in a smooth trunk surface coloured in patches of white, grey and blue, corresponding to areas that shed their bark at different times. Young plants and coppice regrowth have dull bluish green, egg-shaped leaves that are 60–130 mm (2.4–5.1 in) long and 30–80 mm (1.2–3.1 in) wide. Adult leaves are the same shade of green on both sides, lance-shaped to curved, 80–220 mm (3.1–8.7 in) long and 10–35 mm (0.39–1.38 in) wide, tapering at the base to a petiole 13–30 mm (0.51–1.18 in) long. The flower buds are arranged in leaf axils in groups of seven, nine or eleven on an unbranched peduncle 7–25 mm (0.28–0.98 in) long, the individual buds on pedicels 2–6 mm (0.079–0.236 in) long. Mature buds are an elongated oval shape, 9–16 mm (0.35–0.63 in) long and 3–6 mm (0.12–0.24 in) wide with a conical to horn-shaped operculum that is much longer than the floral cup. Flowering has been recorded in most months and the flowers are white. The fruit is a woody, hemispherical capsule 2–6 mm (0.079–0.236 in) long and 4–8 mm (0.16–0.31 in) wide with the valves prominently protruding.[3][4][5][6][7]
Taxonomy and naming

Eucalyptus tereticornis was first formally described 1795 by James Edward Smith in A Specimen of the Botany of New Holland from specimens collected in 1793 from Port Jackson by First Fleet surgeon and naturalist John White.[8][9][4] (Smith's volume was the botanical part of Zoology and Botany of New Holland. The zoological part was written by George Shaw.) The specific epithet (tereticornis) is from the Latin words teres (becoming tereti- in the combined form) meaning "terete" and cornu meaning "horn", in reference to the horn-shaped operculum.[10]

In 1999 Ian Brooker and Andrew Slee described two subspecies and in 2013 Anthony Bean described a further two, and the names of these four subspecies are accepted by the Australian Plant Census:

Eucalyptus tereticornis subsp. basaltica A.R.Bean[11] has opercula that are not expanded at the base, juvenile leaves that are dull bluish, egg-shaped to round, up to one to two times as long as broad, and pedicels 2.5–6 mm (0.098–0.236 in) long;
Eucalyptus tereticornis subsp. mediana Brooker & Slee[12] has opercula that are not expanded at the base, juvenile leaves that are dull bluish, egg-shaped to round, up to one to two times as long as broad, and pedicels 1–3 mm (0.039–0.118 in) long;
Eucalyptus tereticornis subsp. rotunda A.R.Bean[13] has opercula that are not expanded at the base, juvenile leaves that are green, round and up to 1.2 times as long as broad;
Eucalyptus tereticornis Sm. subsp. tereticornis[14] has opercula expanded at the base and juvenile leaves that are lance-shaped to egg-shaped, and two to three times longer than wide.[15]

Distribution and habitat

The species has a wide distribution, occurring over the widest range of latitudes of any Eucalyptus species, occurring from southern Papua New Guinea at latitude 15°S, to southeastern Victoria at latitude 38°S.[10] The forest red gum is one of the key canopy species of the threatened Cumberland Plain Woodlands.[16]

Subspecies basaltica grows in eucalypt woodland from Kroombit Tops to near Sydney with a disjunct population in the Carnarvon Range. Subspecies mediana is endemic to eastern Victoria where it grows near river banks, wetlands, low hills and plains. Subspecies rotunda is endemic to a small area near Mitchell in Queensland, growing along creek banks. Subspecies tereticornis is the most widely distributed of the four subspecies and grows in open forest from the Cape York Peninsula in Queensland, to near Bega in southern New South Wales and as far inland as Roma. It is also known from the Central and Oro Provinces in Papua New Guinea.[3][7][15]

The tree has a strong, hard and durable heartwood, with a density of about 1100 kg m−3. It is used for construction in heavy engineering, such as for railway sleepers.[10] The leaves of E. tereticornis are used in the production of cineole based eucalyptus oil.[17]

See also

List of Eucalyptus species


Fensham, R.; Laffineur, B.; Collingwood, T. (2019). "Eucalyptus tereticornis". IUCN Red List of Threatened Species. 2019: e.T61916689A61916692. doi:10.2305/IUCN.UK.2019-3.RLTS.T61916689A61916692.en. Retrieved 19 November 2021.
"Eucalyptus tereticornis". Australian Plant Census. Retrieved 7 January 2020.
"Eucalyptus tereticornis subsp. tereticornis". Euclid: Centre for Australian National Biodiversity Research. Retrieved 28 May 2020.
Boland, D. J.; et al. (1984). Forest Trees of Australia (4th ed.). ISBN 0-643-05423-5.
Hill, Ken. "Eucalyptus tereticornis". Royal Botanic Garden Sydney. Retrieved 7 January 2020.
Chippendale, George M. "Eucalyptus tereticornis". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 7 January 2020.
Messina, Andre. "Eucalyptus tereticornis subsp. mediana". Royal Botanic Gardens Victoria. Retrieved 7 January 2020.
"Eucalyptus tereticornis". APNI. Retrieved 8 January 2020.
Smith, James Edward (1795). A Specimen of the Botany of New Holland. London: James Sowerby. pp. 41–42. Retrieved 8 January 2020.
Boland, Douglas J.; Brooker, M. Ian H.; Chippendale, George M.; Hall, Norman; Hyland, Bernard P.M.; Johnston, Robert D.; Kleinig, David A.; McDonald, Maurice W.; Turner, John D. (2006). Forest trees of Australia (5th. ed.). Collingwood, Victoria: CSIRO Publishing. p. 322. ISBN 0643069690.
"Eucalyptus tereticornis subsp. basaltica". Australian Plant Census. Retrieved 8 January 2020.
"Eucalyptus tereticornis subsp. mediana". Australian Plant Census. Retrieved 8 January 2020.
"Eucalyptus tereticornis subsp. rotunda". Australian Plant Census. Retrieved 8 January 2020.
"Eucalyptus tereticornis subsp. tereticornis". Australian Plant Census. Retrieved 8 January 2020.
Bean, Anthony R. (2013). "Two new subspecies of Eucalyptus tereticornis". Austrobaileya. 9 (1): 107–112.
"Cumberland Plain Woodland in the Sydney Basin Bioregion - profile". New South Wales Government Office of Environment and Heritage. Retrieved 8 September 2011.
Boland, D.J., Brophy, J.J., and A.P.N. House, Eucalyptus Leaf Oils, 1991, ISBN 0-909605-69-6

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