Eucalyptus deanei
| Mountain Blue Gum | |
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 |
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| giant Eucalyptus deanei, near Woodford in Blue Mountains National Park, Australia | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Rosids |
| Order: | Myrtales |
| Family: | Myrtaceae |
| Genus: | Eucalyptus |
| Species: | E. deanei |
| Binomial name | |
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Eucalyptus deanei Maiden |
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| Synonyms | |
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Eucalyptus saligna var. parviflora H. Deane & Maiden |
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Eucalyptus saligna var. parviflora H. Deane & Maiden
Eucalyptus deanei, the round-leaved- or mountain blue gum is a eucalyptus tree of mountain country of central New South Wales.Eucalyptus deanei is a large to very large tree, usually 45 to 65 metres tall or even taller.
They are most famously seen at the Blue Gum Forest, in Blue Mountains National Park, and by drivers on the Mooney Mooney Bridge on the main road north from Sydney.
Also known by various names including Deane's gum, brown gum, mountain blue gum and round-leaved blue gum, Eucalyptus deanei was first described by Joseph Maiden and still bears its original name. It had been described earlier as Eucalyptus saligna var. parviflora by Deane and Maiden in 1899, when he and his colleague Michael Henry Vigdor went to an exploratory journey. The species name is derived from Australian engineer Henry Deane. who first collected the species in 1888. It has been classified in the subgenus Symphyomyrtus, Section Latoangulatae, Series Transversae (eastern blue gums) by Brooker and Kleinig. Its two closest relatives are the flooded gum (Eucalyptus grandis) and the Sydney blue gum (E. saligna). Its common name is derived from its roundish juvenile leaves, which also distinguish it from its closest relatives.
Lawrie Johnson and Ken Hill reclassified the New England population as a separate species, Eucalyptus brunnea, but the consensus is that the differences are insufficient to warrant separate status.
Eucalyptus deanei generally grows as a straight and tall forest tree, growing to heights of 45 to 65 (or rarely 75) m (150–250 ft) tall with a dbh of up to 2 m (6.6 ft). In less optimal sites, it may be restricted to 20 or 30 m (66 or 98 ft) and have a thicker trunk and more branching crown. The trunk has smooth pale grey or cream bark with a 'skirt' of rougher greyish or brownish bark at the base. The dull dark green lanceolate leaves are arranged alternately along the stems and are 8–13 cm (3.1–5.1 in) long by 2–3.5 cm (0.79–1.38 in) wide. The upper leaf surface is darker than underneath. The white flowers appear in March and April, and are arranged in groups of seven to eleven in umbellasters.
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