Staphyleaceae, the Bladder Nut Family
Shrubs with opposite trifoliate leaves and small axillary clusters of white flowers in spring; sepals, petals, and stamens each 5; ovary 3-celled, ripening into a large inflated 3-celled pod.
One species in Michigan (2-5 m. high) Bladder Nut, Staphylea trifolia.