Eucalyptus sieberi, commonly known as the silvertop ash or black ash, is a species of medium-sized to tall tree that is endemic to south-eastern Australia. It has rough bark on the trunk and the base of larger branches, smooth bark above, lance-shaped to curved adult leaves, flower buds in groups of seven to fifteen, white flowers and barrel-shaped or conical fruit.
|Silvertop ash at Katoomba|
Eucalyptus sieberi is a tree that typically grows to a height of 25–45 m (82–148 ft) but does not form a lignotuber. It has rough bark on the trunk and the larger branches, smooth, white to yellow bark above. The rough bark is thin and flaky on younger trees, but becomes thick and dark grey to black and furrowed with age. Young plants have egg-shaped to lance-shaped or curved, bluish green to glaucous leaves that are 60–170 mm (2.4–6.7 in) long and 16–75 mm (0.63–2.95 in) wide. Adult leaves are the same shade of glossy green on both sides, lance-shaped to curved, 85–195 mm (3.3–7.7 in) long and 12–38 mm (0.47–1.50 in) wide on a petiole 10–20 mm (0.39–0.79 in) long. The flower buds are arranged in leaf axils in groups of between seven and fifteen on an unbranched peduncle 8–16 mm (0.31–0.63 in) long, the individual buds on pedicels 3–7 mm (0.12–0.28 in) long. Mature buds are oval to club-shaped, 3–5 mm (0.12–0.20 in) long and 3–4 mm (0.12–0.16 in) wide with a rounded or flattened operculum. Flowering occurs from September to January and the flowers are white. The fruit is a woody barrel-shaped or conical capsule 6–11 mm (0.24–0.43 in) long and 6–9 mm (0.24–0.35 in) wide with the valves near rim level.
Taxonomy and namingEdit
Eucalyptus sieberi was first formally described in 1962 by Lawrie Johnson in Contributions from the New South Wales Herbarium from specimens collected by Joseph Maiden in Blackheath in 1899. The specific epithet (sieberi) honours the Czech botanist Franz Sieber.
Distribution and habitatEdit
Silvertop ash grows in forest and woodland, often in pure stands, on shallows soils of low to medium fertility. It is found from south-eastern Queensland through the western slopes and plains of New South Wales, the eastern side of the Great Dividing Range in Victoria to north-eastern Tasmania.
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- Chippendale, George M. "Eucalyptus sieberi". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 23 December 2019.
- Brooker, M. Ian H. "Eucalyptus sieberi". Royal Botanic Gardens Victoria. Retrieved 23 December 2019.
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- Jordan, Greg. "Eucalyptus sieberi". University of Tasmania. Retrieved 23 December 2019.
- "Silvertop ash". Timber Development Association. Retrieved 23 December 2019.
- Bootle, Keith (2005). Wood in Australia: types, properties and uses (2nd ed.). New York: McGraw-Hill. ISBN 0-07-471312-4.