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Mimosa pudica
Small, low-to-the-ground brown-stemmed plant with purple puffball blossoms.
This plant was growing by the side of the road in the foothills of northern Thailand on a hot, dry day.
Thanks Jason Alexander for the help.
Now I'm just stuck wondering how a Central and South American weed made it's way to a random hillside in rural northern Thailand, even if it is going pantropic.