Melastoma polyanthum is a species of shrubs, of the plant family Melastomataceae. It widely distributed across Southeast Asia through to Australia, where it occurs mainly near the coasts of the north and east of the country. Common names include Lasiandra, Blue Tongue, Straits Rhododendron and Chinese Wild Peony. Its fruits are edible though staining the mouth black, and the leaves and sap are used in herbal medicine.
M. polyanthum is a shrub, to 2.5 metres. The leaves are opposite, elliptical, coarsely hairy, with three longitudinal veins. The 8 mm petiole too is hairy. The bark is gray and scaly. The flowers are purple, to 8 cm, with yellow stamens. There are 5 petals.
The plant is used to make grass jelly (cincau perdu) in Indonesia. The fruits ripen to dark gray, and contain an edible purple pulp around the seeds. It stains the mouth black (hence the name of the genus).
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