bladdernut

noun

1. the bladderlike fruit capsule of any shrub or small tree of the genus Staphylea, as S. trifolia, of the eastern U.S.
2. the shrub itself.

noun

1. any temperate shrub or small tree of the genus Staphylea, esp S. pinnata of S Europe, that has bladder-like seed pods: family Staphyleaceae
2. the pod of any such tree