Everything about Melaleuca totally explained
Melaleuca is a
genus of
plants in the myrtle family
Myrtaceae. There are well over 200 recognised species, most of which are endemic to
Australia.
The species are
shrubs and
trees growing (depending on species) to 2–30 m tall, often with flaky, exfoliating
bark. The
leaves are
evergreen, alternately arranged, ovate to lanceolate, 1-25 cm long and 0.5-7 cm broad, with an entire margin, dark green to grey-green in colour. The
flowers are produced in dense clusters along the stems, each flower with fine small petals and a tight bundle of stamens; flower colour varies from white to pink, red, pale yellow or greenish. The
fruit is a small capsule containing numerous minute
seeds.
Melaleuca is closely related to
Callistemon, the main difference between the genera being that the
stamens are generally free in
Callistemon but grouped into bundles in
Melaleuca.
In the wild,
Melaleuca plants are generally found in open forest, woodland or shrubland, particularly along watercourses and the edges of swamps.
The best-accepted common name for
Melaleuca is simply
melaleuca; however most of the larger species are also known as
paperbarks, and the smaller types as
honey myrtles. They are also sometimes referred to as
punk trees.
One well-known melaleuca, the
Ti tree (aka tea tree),
Melaleuca alternifolia, is notable for its
essential oil which is both
anti-fungal, and
antibiotic, while safely usable for topical applications. This is produced on a commercial scale, and marketed as
Tea Tree Oil. The Ti tree isn't actually usable for making tea, but presumably named for the brown colouration of many water courses caused by shed leaves from this species and other similar species trees, for a famous example see
Brown Lake (Stradbroke Island)). The name "tea tree" is also used for a related genus,
Leptospermum. Both Leptospermum and Melaleuca are
myrtles of the family,
Myrtaceae.
In Australia,
Melaleuca species are sometimes used as food plants by the
larvae of
hepialid moths of the genus
Aenetus including
A. ligniveren. These burrow horizontally into the trunk then vertically down.
Melaleucas are popular garden plants, both in Australia and other tropical areas worldwide. In
Hawaii and the
Florida everglades,
Melaleuca quinquenervia (Broad-leaved Paperbark) was introduced in order to help drain low-lying swampy areas. It has since gone on to become a serious
invasive weed with potentially very serious consequences being that the plants are highly flammable and spread agreesively. Melaleuca populations have nearly quadrupled in southern Florida over the past decade, as can be noted on
IFAS's
SRFer Mapserver
The genus
Callistemon was recently placed into
Melaleuca.
Uses
Traditional Aboriginal uses
Aborigines used the leaves traditionally for many
medicinal purposes, including chewing the young leaves to alleviate
headache and for other ailments.
The softness and flexibility of the paperbark itself made it an extremely useful tree to Aboriginal people. It was used to line
coolamons when used as cradles, as a
bandage, as a sleeping mat, and as material for building
humpies. It was also used for wrapping food for cooking (in the same way aluminium foil is today), as a disposable raincoat, and for tamping holes in canoes. In the
Gadigal language, it's called
Bujor.
Modern uses
Scientific studies have shown that tea tree oil made from
Melaleuca alternifolia is a highly effective
topical antibacterial and
antifungal, although it may be toxic when ingested internally in large doses or by children. In rare cases, topical products can be absorbed by the skin and result in toxicity.
The oils of Melaleuca can be found in
organic solutions of medication that claims to eliminate
warts, including the
Human papillomavirus. No scientific evidence proves this claim (reference: "Forces of Nature: Warts No More").
Melaleuca oils are the active ingredient in Burn-Aid, a popular minor burn
first aid treatment (an offshoot of the brandname
Band-Aid).
Melaleuca oils (tea tree oil) is also used in many pet fish remedies (such as Melafix and Bettafix) to treat bacterial and fungal infections. Bettafix is a lighter dilution of tea tree oil while Melafix is a stronger dilution. It is most commonly used to promote fin and tissue regrowth. The remedies are often associated with
Betta fish (
Siamese Fighting Fish) but are also used with other fish.
Weeds
Melaleucas were introduced to
Florida in the
United States in the early 20th century to assist in drying out swampy land and as garden plants.
Once widely planted in Florida, it forms dense thickets and displaces native vegetation on of wet pine flatwoods, sawgrass marshes, and cypress swamps in the southern part of the state. [It is prohibited by DEP and listed as a noxious weed by FDACS.
Image:Paperbark.jpg|A paperbark in Melbourne
Image:Melaleuca quinquenervia bark.jpg|Melaleuca quinquenervia bark showing the papery exfoliation from which the common name 'paperbark' derives
Image:Paperbark-trees-in-Tasmania.jpg|Paperbark trees in Tasmania after sunset
Image:Koeh-092.jpg|19th century illustration of Melaleuca leucadendra
Further Information
Get more info on 'Melaleuca'.
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