n.
[植]舞草

[ noun ]
erect tropical Asian shrub whose small lateral leaflets rotate on their axes and jerk up and down under the influence of sunshine
<noun.plant>

Telegraph plant \Telegraph plant\ (Bot.),
A tick trefoil ({Meibomia gyrans} formerly {Desmodium
gyrans}), native of the East Indies; it is a leguminous plant
whose lateral leaflets jerk up and down like the arms of a
semaphore, and also rotate on their axes.
[Webster 1913 Suppl.]