sensitive plant

noun

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

noun

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