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Mimosa pudica
Mimosa pudica (from Latin: pudica "shy, bashful or shrinking"; also called Sensitive Plant and the touch-me-not), is a creeping annual or perennial herb often grown for its curiosity value: the compound leaves fold inward and droop when touched or shaken, re-opening minutes later. The species is native to South America and Central America, but is now a pantropical weed.
Thank you for the ID suggestion, I don't remember seeing the flower before but the plant is very common.