Eucalyptus dorrigoensis

Eucalyptus dorrigoensis, commonly known as the Dorrigo white gum,[2] is a species of tree that is endemic to New South Wales. It has smooth white, grey or pink bark, lance-shaped to curved adult leaves, flower buds in groups of seven, white flowers and cup-shaped, conical or hemispherical fruit.

flower buds
fruit

Dorrigo white-gum
Eucalyptus dorrigoensis growing near Dorrigo
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Eucalyptus
Species:
E. dorrigoensis
Binomial name
Eucalyptus dorrigoensis
Synonyms[1]
  • Eucalyptus benthamii var. dorrigoensis Blakely
  • Eucalyptus benthami var. dorrigoensis Blakely orth. var.

Description

Eucalyptus dorrigoensis is a tree that typically grows to a height of 30 m (98 ft) and forms a lignotuber. It has smooth, slightly powdery white, grey or pink bark, sometimes with slabs of rough bark near the base. Young plants and coppice regrowth have warty stems, the leaves arranged in opposite pairs and egg-shaped to broadly lance-shaped, 35–80 mm (1.4–3.1 in) long and 13–40 mm (0.51–1.57 in) wide. Adult leaves are the same colour on both sides, lance-shaped to curved, 60–220 mm (2.4–8.7 in) long and 12–27 mm (0.47–1.06 in) wide on a petiole 5–25 mm (0.20–0.98 in) long. The flower buds are arranged in groups of seven in leaf axils on an unbranched peduncle 4–10 mm (0.16–0.39 in) long, the individual buds on a pedicel 1–3 mm (0.039–0.118 in) long. Mature buds are oval, 4–5 mm (0.16–0.20 in) long and 2–3 mm (0.079–0.118 in) wide with a conical operculum. Flowering occurs in May and the flowers are white. The fruit is a woody conical or hemispherical capsule 3–4 mm (0.12–0.16 in) long and 4–5 mm (0.16–0.20 in) wide with the valves extended beyond the rim.[2][3][4][5]

Taxonomy and naming

Dorrigo white gum was first formally described in 1934 by William Blakely in his book A Key to Eucalypts and given the name Eucalyptus benthamii var. dorrigoensis.[6] In 1990, Lawrie Johnson and Ken Hill raised the variety to species status as Eucalyptus dorrigoensis.[4][7] The specific epithet (dorrigoensis) is a reference to the distribution of this species near Dorrigo - the ending -ensis is a Latin suffix "denoting place, locality [or] country".[3][8]

Distribution and habitat

Eucalyptus dorrigoensis grows in deep soils in valley forests from near the upper Macleay River to east of Tenterfield and mainly near Dorrigo.[2][5]

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See also

References
  1. "Eucalyptus dorrigoensis". Australian Plant Census. Retrieved 24 June 2019.
  2. Hill, Ken. "Eucalyptus dorrigoensis". Royal Botanic Garden Sydney. Retrieved 24 June 2019.
  3. "Eucalyptus dorrigoensis". Euclid: Centre for Australian National Biodiversity Research. Retrieved 4 June 2020.
  4. Johnson, Lawrence A.S.; Hill, Kenneth D. (26 September 1990). "New taxa and combinations in Eucalyptus and Angophora (Myrtaceae)". Telopea. 4 (1): 63. doi:10.7751/telopea19904916.
  5. Chippendale, George M. "Eucalyptus benthamii var. dorrigoensis". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 24 June 2019.
  6. "Eucalyptus benthamii var. dorrigoensis". APNI. Retrieved 24 June 2019.
  7. "Eucalyptus dorrigoensis". APNI. Retrieved 24 June 2019.
  8. Brown, Roland Wilbur (1956). The Composition of Scientific Words. Washington, D.C.: Smithsonian Institution Press. p. 303.
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