Nice spot! This is something in the family Melastomataceae (http://en.wikipedia.org/wiki/Melastomataceae), possibly either an Osbeckia (http://en.wikipedia.org/wiki/Osbeckia) or Tibouchina species. An Osbeckia could be native to Thailand but if this is in a garden, there's a chance of it being a Tibouchina (which are all New World plants, S.America, Caribbean etc)
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