Mimosa pudica (from Latin: pudica "shy, bashful or shrinking"; also called sensitive plant, sleepy plant, action plant, touch-me-not, shameplant) Choi Moi (pronounced chouyi mouyi) is the Urdu name of this plant, which is found in the wild in Pakistan and other countries. Children adore finding it and touching its tight-curling leaves. Because of this, it's also known as the sensitive plant, the humble plant, Touch Me Not, and presumably a slew of other names that all refer to its shrinking properties; the Latin name pudica, for example, means timid.
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When the leaves are touched, the stem releases chemicals that drive water out of the cells, causing them to collapse. The plant has a nyctinasty movement, which means it closes its leaves at night or in the evening.
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