1) The shrub itself 
any shrub or small tree of the genus Staphylea of the family Staphyleaceae. All of the 10–15 known species occur in the North Temperate Zone.[1 related articles]
the bladderlike fruit capsule of any shrub or small tree of the genus Staphylea, as S. trifolia, of the eastern U.S. · the shrub itself.