Eucalyptus globulus subsp. globulus, commonly known as the Tasmanian blue gum, southern blue gum, or blue gum,[2] is a subspecies of tree that is endemic to southeastern Australia. It has mostly smooth bark with some persistent slabs of old bark at the base, juvenile leaves with one glaucous side, glossy, lance-shaped adult leaves, warty flower buds arranged singly in leaf axils, white flowers and hemispherical to conical fruit that is more or less square in cross-section.
| Tasmanian blue gum | |
|---|---|
| |
| E. globulus globulus at Port Arthur | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Rosids |
| Order: | Myrtales |
| Family: | Myrtaceae |
| Genus: | Eucalyptus |
| Species: | |
| Subspecies: | E. g. subsp. globulus
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| Trinomial name | |
| Eucalyptus globulus subsp. globulus | |
| Synonyms[1] | |
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Eucalyptus globulus Labill. var. globulus | |
Description
editEucalyptus globulus subsp. globulus is a tree that typically grows to a height of 70 m (230 ft) and forms a lignotuber. The bark is mostly smooth, shedding in long strips to leave a white or greyish surface. There is sometimes rough, partially shed bark at the base of the trunk and ribbons of shedding bark in the upper branches. Young plants and coppice regrowth have stems that are more or less square in cross-section, with a prominent wing on each corner. The juvenile leaves are sessile, arranged in opposite pairs, elliptic to egg-shaped, the lower surface covered by a white, waxy bloom, 40–105 mm (1.6–4.1 in) long and 22–50 mm (0.87–1.97 in) wide. Adult leaves are arranged alternately, glossy green, lance-shaped to curved, 120–300 mm (4.7–11.8 in) long and 17–30 mm (0.67–1.18 in) wide on a petiole 20–35 mm (0.79–1.38 in) long.[2][3][4]
The flower buds are arranged singly in leaf axils on a thick peduncle that is sessile or up to 5 mm (0.20 in) long. Mature buds are glaucous, conical and warty, 14–25 mm (0.55–0.98 in) long and 14–20 mm (0.55–0.79 in) wide with four ribs along the sides and a flattened operculum that has a central knob. Flowering occurs between May and January and the flowers are white. The fruit is a woody, sessile, hemispherical to conical capsule, square in cross-section, 10–15 mm (0.39–0.59 in) long and 14–27 mm (0.55–1.06 in) wide with four longitudinal ridges and the valves at about rim level.[2][3][4]
Taxonomy and naming
editTasmanian blue gum was first formally described in 1800 by Jacques Labillardière in his book, Relation du Voyage à la Recherche de la Pérouse.[5][6][7] In 1974, James Barrie Kirkpatrick described four subspecies of E. globulus and E. globulus subsp. globulus became the autonym.[8][9]
Distribution and habitat
editThis blue gum grows in woodland and forest in moist valleys in Victoria and Tasmania, including on Flinders and King Islands. It is common in lowland areas of Tasmania but is only found in the far south of Victoria, including in places like Port Franklin and Wilsons Promontory.[4][3]
Tallest specimens
editIn 2021 an 80 metre tall specimen, regarded as being the largest known remaining Tasmanian blue gum and estimated as being 500 years old, was discovered in the Huon Valley, in a coup originally slated for logging in 2023. This tree, named "Lathamus Keep" by conservationists, is likely to be protected as a recognised giant tree by Sustainable Timber Tasmania, but conservationists are still concerned over its future.[10]
References
edit- ^ a b "Eucalyptus globulus subsp. globulus". Australian Plant Census. Retrieved 18 July 2019.
- ^ a b c "Eucalyptus globulus subsp. globulus". Centre for Australian Biodiversity Research. Retrieved 2 June 2020.
- ^ a b c Brooker, M. Ian H.; Slee, Andrew V. "Eucalyptus globulus subsp. globulus". Royal Botanic Gardens Victoria. Retrieved 18 July 2019.
- ^ a b c Chippendale, George M. "Eucalyptus globulus subsp. globulus". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 18 July 2019.
- ^ "Eucalyptus globulus". APNI. Retrieved 17 July 2019.
- ^ La Billardière, Jacques-Julien Houtou de (1800). Relation du Voyage à la Recherche de la Pérouse. Paris: chez H. J. Jansen. p. 13. Retrieved 17 July 2019.
- ^ La Billardière, Jacques-Julien Houtou de (1800). Relation du Voyage à la Recherche de la Pérouse. Paris: chez H. J. Jansen. p. 153. Retrieved 17 July 2019.
- ^ Kirkpatrick, James Barrie (September 1974). "The numerical intraspecific taxonomy of Eucalyptus globulus Labill. (Myrtaceae)". The Botanical Journal of the Linnean Society. 69 (2): 89–104. doi:10.1111/j.1095-8339.1974.tb01618.x.
- ^ "Eucalyptus globulus subsp. globulus". APNI. Retrieved 17 July 2019.
- ^ Abbott, Sarah, Photographing 'world's biggest blue gum' to shine light on 500yo giant in logging coupe ABC News, 4 November 2022. Retrieved 4 November 2022.