humble plant
     n : prostrate or semi-erect subshrub of tropical America, and
         Australia; heavily armed with recurved thorns and having
         sensitive soft gray-green leaflets that fold and droop at
         night or when touched or cooled [syn: {sensitive plant},
         {touch-me-not}, {shame plant}, {live-and-die}, {action
         plant}, {Mimosa pudica}]
Source: WordNet® 2.0