Eucalyptus oldfieldii, commonly known as Oldfield's mallee, is a species of mallee or small tree in the family Myrtaceae, endemic to the south‑west of Western Australia.
Description
- Growth form: Usually a multi‑stemmed mallee reaching 2–6 m in height, occasionally developing a single trunk.
- Bark: Smooth, powdery, pale grey to white, shedding in ribbons.
- Leaves: Juvenile leaves are opposite, sessile, and broadly lanceolate; adult leaves are alternate, narrow‑lanceolate, glossy green, and have a petiole.
- Inflorescence: Flower buds are arranged in axillary clusters of three to seven; buds are oval to spindle‑shaped with a conical operculum.
- Flowers: White, blooming primarily from September to February.
- Fruit: Woody, hemispherical to barrel‑shaped capsules containing numerous small seeds.
Taxonomy and naming
- The species was first formally described in 1867 by botanist George Bentham in Flora Australiensis.
- The specific epithet oldfieldii honours Augustus Frederick Oldfield (1821–1887), an Australian naturalist who collected specimens in Western Australia.
Distribution and habitat
- Geographic range: Restricted to the Wheatbelt and Goldfields‑Esperance regions of Western Australia, from near Wongan Hills southwards to the Esperance district.
- Habitat: Grows on sandy or loamy soils, often on sandplains and low hills, typically within heathland or shrubland communities.
Ecology
- Pollination is primarily by insects and birds attracted to the nectar of the white flowers.
- The species is adapted to fire‑prone environments; it regenerates after fire by resprouting from lignotubers.
Conservation status
- The Western Australian Government Department of Biodiversity, Conservation and Attractions classifies Eucalyptus oldfieldii as “Not Threatened,” indicating stable populations within its native range.
References
- Bentham, G. (1867). Flora Australiensis (Vol. 3). London: L. Reeve & Co.
- Brooker, M. I. H., & Kleinig, D. A. (2006). Field Guide to Eucalyptus. Blooming Books.
- Western Australian Herbarium. (2023). FloraBase—the Western Australian Flora. Department of Biodiversity, Conservation and Attractions.
Note: The information presented is based on established botanical literature and governmental resources.
