Physocarpus

Physocarpus, commonly called ninebark, is a genus of flowering plants in the family Rosaceae, native to North America (most species) and northeastern Asia (one species).

The genus name Physocarpus comes from the Greek for "bladder fruit", referring to the inflated fruits of some species. The common name 'ninebark' refers to the peeling bark of mature branches, which comes away in strips.