Blood-red Melastoma (毛菍)

Blood-red Melastoma (Melastoma sanguineum) is a common native shrub that looks similar to Common Melastoma (野牡丹), but the former has longer and sharper leaves.
Flower in Purple / Violet with 7 Petals
Photo taken at Eagle's Nest Nature Trail (鷹巢山自然教育徑), Tai Po Road, Hong Kong

It is more adapted to the shaded woodland environment, while Common Melastoma prefers sunny locations.