|M. viridoflora near Canal Creek, Queensland|
Melaleuca viridiflora, commonly known as broad-leaved paperbark is a plant in the myrtle family, Myrtaceae and is native to woodlands, swamps and streams of monsoonal areas of northern Australia and New Guinea. It is usually a small tree with an open canopy, papery bark and spikes of cream, yellow, green or red flowers.
Melaleuca viridiflora is a shrub or small tree usually growing to 10 m (30 ft) tall, sometimes twice that height, with white, brownish or grey bark and an open canopy. Its leaves are 70–195 mm (3–8 in) long, 19–76 mm (0.7–3 in) wide, thick, broadly elliptic and aromatic.
The flowers are cream, yellow, yellow-green or occasionally red and arranged in spikes on the ends of branch which continue to grow after flowering and sometimes also in the upper leaf axils. Each spike contains 8 to 25 groups of flowers in threes and is up to 100 mm (4 in) long and 55 mm (2 in) in diameter. The petals are 4–5.3 mm (0.16–0.21 in) long and fall off as the flower matures. There are five bundles of stamens around the flower, each with 6 or 9 stamens although the stamens are only weakly joined in bundles. Flowering can occur at any time of the year but most commonly happens in winter. Flowering is followed by fruit which are woody capsules 5–6 mm (0.20–0.24 in) long, scattered along the stem, each containing numerous fine seeds.
Taxonomy and naming
Melaleuca viridiflora was first formally described in 1788 by Daniel Solander, the description published by Joseph Gaertner in De fructibus et seminibus plantarum including a carefully drawn figure of the stamen bundle and fruiting capsules. The description was made during the forced stay of the Endeavour on the banks of the Endeavour River, at the site of the present-day Cooktown, during the first voyage of James Cook. The specific epithet (viridiflora) is from the Latin viridis meaning "green":383 and flos meaning "flower":338 referring to the most common flower colour of this species.
Distribution and habitat
This melaleuca occurs in tropical areas of Australia, including as far south as Maryborough in Queensland, northern parts of Western Australia south to the Dampier Peninsula district, and the northern half of the Northern Territory. It is also found in the southern part of West Papua in Indonesia and southern Papua New Guinea It grows on the margins of gallery forest, in forest, woodland and swampy plains in a variety of soils.
Melaleuca viridiflora forests provide habitat for orchid species including the rare, threatened or endangered Calochilus psednus, Pachystoma pubescens, Eulophia bicallosa and Cardwell midge orchid (Genoplesium tectum). Individual trees often host the epiphytic ant-house plant, (Myrmecodia beccarii).
Melaleuca viridiflora is used by Aboriginal Australians for multiple uses. The bark is peeled off in layers and is used for shelter, bedding, containers, storing and cooking food, fire tinder, water craft, fish traps and wrapping corpses. In traditional medicine, an infusion from leaves was drunk, inhaled or used for bathing to treat coughs, colds, congestion, headache, fever and influenza.
Different populations of this species yield different oils but there are two distinct groups. One is rich in terpenic oil but otherwise highly variable with three distinct chemotypes. Another population is rich in methyl cinnamate with two chemotypes.
Melaleuca viridiflora is a useful and adaptable small tree in cultivation, with the red-flowered form being preferred. It is suitable for tropical and subtropical areas where there is high summer rainfall, especially in heavy clay soils. Its open canopy makes it a useful host tree for epiphytes such as Dendrobium.
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