Sensitive plant

Description:

Small erect or creeping herb, sometimes spreading as much as 2 or 3 feet, though usually smaller, with pinnately-compound leaves that have 10 to 26 pairs of small oval leaflets along each stemlet. The flowers are small pink fuzzy balls about 1/2 inch in diameter, followed by clusters of 2 to 8 pods containing seeds. The stems are purplish in color and bear small prickles.

Notes:

The compound leaves fold inward and droop when touched or shaken, to protect them from predators, re-opening minutes later. They also fold up at night.