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This invasive weed (origin: Central & South America) is found throughout Papua along roads, trails and on cleared land. It is a sensitive plant with leaves that fold up at night and when touched, hence its personified names in many languages (e.g. "putri malu" in Indonesian = "shy maiden") which refer to this attribute.
This species is visible lining almost all of the unshaded sections of the entire north coast road in Papua, and this spotting was photographed along this road.
In the last photo I touched the plant and it folded up so tight one can barely see it (upper right of photo).