Rounded rainforest shrub, attractively veined foliage, long flowering mauve-purple flowers in summer and sweet edible fruit (which will stain your tongue blue, thus the common name).
Attracts Miskin Jewel butterfly, birds. Useful wetland plant. Honey bees compete with its natural pollinator, native bees.
Flowers are large with usually 5 mauve petals. These are followed by fruits which split open to reveal red to purple flesh with numeous small seeds.
Leaves ovate, 6-12 cm long, 2-4 cm wide, discolorous, covered with short, stiff hairs; main veins 3, and 2 less conspicuous intramarginal veins; petiole up to 10 mm long.
M. affine occurs well beyond Australia, through much of Indonesia and some Pacific Islands.
The taxonomy of the melastoma group is tricky with Meyer proposing to revise this species into M. malabathricum subsp. malabathricum in Blumea 46(2): 351–398 (2001). However, this hasn't been fully accepted (Wikipedia)
M. affine is important as being a pioneer species that colonises disturbed wet-sclerophyll and rain forest habitats in the Australasian region. It produces no nectar - giving pollinators large amounts of pollen instead, which must be extracted through pores on the anthers -- C. L. Gross. "The Breeding System and Pollinators of Melastoma affine (Melastomataceae); A Pioneer Shrub in Tropical Australia". Biotropica, Vol. 25, No. 4. (Dec., 1993), pp. 468-474.