sensitive plant

Also called humble plant. a tropical American plant, Mimosa pudica, cultivated in greenhouses, having bipinnate leaves whose leaflets fold together when touched.
any of various other plants that are sensitive to touch.

1650–60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sensitive plant
1.  a tropical American mimosa plant, Mimosa pudica, the leaflets and stems of which fold if touched
2.  any similar plant, such as the leguminous plant Cassia nictitans of E North America
3.  informal a person who is easily upset

Collins English Dictionary - Complete & Unabridged 10th Edition
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