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Mimosa diplotricha
Left undisturbed, the plant can grow 2 meters high and its big and sharp spines make it indeed a very unwelcome guest.
this was a species of Mimosa related to Sensitive plant. its stems were spinny and usually grows taller than Mimosa pudica.. try this one as comparison
http://www.projectnoah.org/spottings/173...
The leaf was not sensitive, there was no reaction when we touched and the stem was different.. But thanks for the genus suggestion, you're right, that's Mimosa sp.