Melaleuca argentea

Melaleuca argentea, commonly known as the silver cajuput, silver cadjeput or silver-leaved paperbark is a plant in the myrtle family, Myrtaceae and is endemic to northern Australia. It is a common tree along river banks or around swamps in the tropics. It has papery bark and weeping foliage and has been the subject of important scientific research.

Silver cajuput
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Myrtales
Family: Myrtaceae
Genus: Melaleuca
Species:
M. argentea
Binomial name
Melaleuca argentea

Description

Melaleuca argentea is a tree usually to 8 m (30 ft) but sometimes to 20 m (70 ft). The leaves are arranged alternately along the branches and are elliptic, straight or sickle-shaped, 50–130 mm (2–5 in) long, about 7–24 mm (0.3–0.9 in) wide and have 5 to 9 longitudinal veins. Mature leaves are pale, silvery green and the young growth is soft, silvery and covered with silky soft hairs. The leaves are aromatic when crushed.[2][3][4]

The flowers are arranged in spikes on the ends of branches which continue to grow after flowering, sometimes also in the upper leaf axils. The spikes contain 5 to 20 groups of flowers in threes and are up to 30 mm (1 in) in diameter. The petals are about 3 mm (0.1 in) long and fall off as the flower ages. The stamens are in 5 bundles around the flower with 7 to 9 stamens per bundle. Flowering occurs in most months of the year and is followed by fruit which are woody, cup-shaped to cylindrical capsules, 3–4 mm (0.1–0.2 in) in diameter and loosely spaced along the branches.[2][3][4]

Taxonomy and naming

Melaleuca argentea was first formally described in 1918 by William Fitzgerald in "Journal and Proceedings of the Royal Society of Western Australia" from specimens he collected from the "Isdell, Charnley, Fitzroy, Ord, Denham Rivers, etc."[1] The specific epithet (argentea) is from the Latin argenteus, meaning "silvery".[2]

Distribution and habitat

Silver cajuput occurs in the Kimberley district of Western Australia, the Top End of the Northern Territory and north Queensland.[3] Forests of M. argentea occur along swampy drainage lines in similar niches to Melaleuca quinquenervia which they displace in the far northern coastal portions of the wet tropics bioregion.[5]

Ecology

The life span of this species has been determined to be greater than 20 years. It first forms seeds at the age of 6–10 years and recovers from fire by regrowing from a lignotuber.[6]

Conservation status

Melaleuca argentea is classified as "not threatened" in Western Australia by the Government of Western Australia Department of Parks and Wildlife.[7]

Uses

Horticulture

This tree described as a "handsome, weeping, silver-leaved tree" is suitable for tropical and sub-tropical areas. It is used as an ornamental tree in Brisbane.[3]

Scientific research

Research has been undertaken to determine the water use characteristics of Melaleuca argentea in the Pilbara region of Western Australia so that its response to changes in water levels over time can be predicted.[8] Daily and seasonal water use patterns of this species have also been determined. The information is important because vegetation along riverbanks protects water quality, regulating stream temperature (through shading), water turbidity and river bank stability. Riparian communities are important wildlife corridors and often have higher biodiversity than surrounding ecosystems.[9]

References
  1. "Melaleuca argentea". APNI. Retrieved 7 March 2015.
  2. Brophy, Joseph J.; Craven, Lyndley A.; Doran, John C. (2013). Melaleucas : their botany, essential oils and uses. Canberra: Australian Centre for International Agricultural Research. p. 79. ISBN 9781922137517.
  3. Holliday, Ivan (2004). Melaleucas : a field and garden guide (2nd ed.). Frenchs Forest, N.S.W.: Reed New Holland Publishers. pp. 22–23. ISBN 1876334983.
  4. "Melaleuca argentea". Australian tropical rainforest plants. Archived from the original on 2 April 2015. Retrieved 7 March 2015.
  5. "Sclerophyll forests and woodlands of the wet tropics bioregion" (PDF). Wet tropic management authority. Retrieved 7 March 2015.
  6. "Fire responses of Melaleuca argentea". Northern lands manager. Archived from the original on 28 March 2012. Retrieved 7 March 2015.
  7. "Melaleuca argentea". FloraBase. Western Australian Government Department of Parks and Wildlife.
  8. "Determining water level ranges of Pilbara riparian species" (PDF). Government of Western Australia department of water. Retrieved 7 March 2015.
  9. O'Grady, A.P.; Eamus, D.; Cook, P.G.; Lamontagne, S. (2005). "Comparative water use by the riparian trees Melaleuca argentea and Corymbia bella in the wet–dry tropics of northern Australia" (PDF). Tree Physiology. 26 (2): 219–228. doi:10.1093/treephys/26.2.219. PMID 16356919. Retrieved 7 March 2015.
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