Taxonomy
- Kingdom: Plantae
- Clade: Angiosperms
- Clade: Eudicots
- Order: Myrtales
- Family: Myrtaceae
- Genus: Eucalyptus
- Species: Eucalyptus brassiana S.T.Blake
The species was formally described by S.T. Blake in 1977 (Austrobaileya 1: 1). The specific epithet honors the plant collector and botanist Leonard John Brass (1900–1971).
Common names
Cape York gum, gum‑topped peppermint, Cape York red gum, “karo” (Papua New Guinea).
Description
Eucalyptus brassiana is an evergreen tree that typically attains heights of 20–30 m in favorable conditions, though individuals on poorer soils may reach only 7–15 m. The trunk bears rough, hard, fissured bark, while the branches are covered with smooth, grey‑ish bark that peels in narrow strips. Adult leaves are narrow, lance‑shaped and hang pendently. Flower buds occur in groups of seven; the flowers are white. Fruit are woody, hemispherical to cup‑shaped capsules. The species develops a lignotuber—a woody swelling at the base of the stem that contains dormant buds, enabling resprouting after fire or severe damage.
Distribution and habitat
Native to the wet tropical region extending from southern New Guinea to northern Queensland, Australia. It occupies a range of habitats including rocky slopes, undulating terrain, seasonally inundated flats, and depressions, from sea level up to about 560 m elevation. The species tolerates a variety of soil types, from sandy to clay, and prefers well‑drained conditions with a pH around 5.5–6.5, though it can endure slightly more acidic or alkaline soils. Annual rainfall in its native range is typically 1 000–1 500 mm, with a short dry season of 2–3 months.
Ecology
The tree produces nectar-rich white flowers that attract bees and other insects, contributing to local pollinator communities. Its lignotuber and fire‑resilient bark allow it to regenerate after wildfire, a common disturbance in its native ecosystems.
Uses
- Timber: Wood is strong, durable, and has an interlocked grain; it is harvested both from wild trees and cultivated plantations for construction and other applications.
- Essential oil: Leaves yield an essential oil (approximately 0.5–0.7 % of fresh leaf weight) rich in α‑pinene, 1,8‑cineole, and citronellal.
- Agroforestry: The species has been noted as a potential agroforestry tree, suitable for planting on the margins of rice fields and other low‑land agricultural settings.
- Cultivation: Grown in tropical and subtropical regions for its rapid growth, tolerance of seasonal soil inundation, and utility in land‑reclamation projects.
Conservation status
Available sources do not provide an assessment of Eucalyptus brassiana on the IUCN Red List or other major conservation databases. Consequently, its formal conservation status has not been documented in the consulted references.
References
- Kew Science, Plants of the World Online. “Eucalyptus brassiana S.T.Blake.”
- Useful Tropical Plants. “Eucalyptus brassiana – Cape York Red Gum.”
- Lucid Central – EUCLID: Eucalypts of Australia. Species profile for Eucalyptus brassiana.
- Various botanical publications cited within the above databases.