Oldfield's mallee
Eucalyptus oldfieldii in the Die Hardy Range
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Eucalyptus
Species:
E. oldfieldii
Binomial name
Eucalyptus oldfieldii
Synonyms[1]
  • Eucalyptus oldfieldi F.Muell. orth. var.
  • Eucalyptus oldfieldii F.Muell. var. oldfieldii
leaves, flower buds and flowers

Eucalyptus oldfieldii, commonly known as Oldfield's mallee,[2] is a species of mallee or tree that is endemic to Western Australia. It has a sprawling or spreading habit, mostly smooth greyish or brownish bark, lance-shaped adult leaves, flower buds in groups of three, white flowers and conical, cup-shaped or hemispherical fruit.

Description

Eucalyptus oldfieldii is mallee or tree with a sprawling, spreading habit, typically grows to a height of 2–6 m (6 ft 7 in – 19 ft 8 in) and forms a lignotuber. It has smooth, mottled greyish or brownish bark, often with ribbons of imperfectly shed bark near the base. Young plants and coppice regrowth have dull greyish green, broadly lance-shaped to egg-shaped leaves that are 60–120 mm (2.4–4.7 in) long and 10–35 mm (0.39–1.38 in) wide. Adult leaves are arranged alternately, the same shade of dull green to greyish green on both sides, lance-shaped, 63–115 mm (2.5–4.5 in) long and 9–25 mm (0.35–0.98 in) wide, tapering to a petiole 12–28 mm (0.47–1.10 in) long. The flower buds are arranged in leaf axils in groups of three on an unbranched peduncle 1–11 mm (0.039–0.433 in) long, the individual buds sessile or on pedicels up to 5 mm (0.20 in) long. Mature buds are spherical to oval, slightly ribbed, 12–22 mm (0.47–0.87 in) long and 9–15 mm (0.35–0.59 in) wide with a rounded to flattened operculum that has a prominent beak. Flowering occurs between May and October and the flowers are white or creamy white. The fruit is a woody, conical to cup-shaped or hemispherical capsule 5–12 mm (0.20–0.47 in) long and 10–12 mm (0.39–0.47 in) wide with the valves protruding above the rim. The seeds are pyramid-shaped, brown to pale grey-brown, 1.5–3 mm (0.059–0.118 in) long.[2][3][4]

Taxonomy and naming

Eucalyptus oldfieldii was first formally described by the botanist Ferdinand von Mueller in 1860 in Fragmenta Phytographiae Australiae.[5] The name of the species honours Augustus Frederick Oldfield who collected the type specimen near the Murchison River.[6][7]

Distribution and habitat

Oldfield's mallee is found on sand plains and ridges and on rocky slopes and is widespread north and north-east of Perth to near Shark Bay and Warburton, where it grows in rocky loamy soils over ironstone.[2][3]

Conservation status

This eucalypt is classified as "not threatened" by the Western Australian Government Department of Parks and Wildlife.[2]

See also

References

  1. 1 2 "Eucalyptus oldfieldii". Australian Plant Census. Retrieved 19 November 2019.
  2. 1 2 3 4 "Eucalyptus oldfieldii". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
  3. 1 2 "Eucalyptus oldfieldii". Euclid. CSIRO. Retrieved 31 May 2020.
  4. ↑ Chippendale, George M. "Eucalyptus oldfieldii". Australian Biological Resources Study, Department of the Environment and Energy, Canberra. Retrieved 19 November 2019.
  5. ↑ "Eucalyptus oldfieldii". APNI. Retrieved 19 November 2019.
  6. ↑ von Mueller, Ferdinand (1860). Fragmenta phytographiae Australiae. Melbourne: Victorian Government Printer. p. 37. Retrieved 19 November 2019.
  7. ↑ "Oldfield, Augustus Frederick". Biographical entry. Encyclopedia of Australian Science. 2010. Retrieved 26 December 2010.
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