Physocarpus, commonly called ninebark, is a genus of flowering plants in the family Rosaceae. All but two species are native to North America; the two outliers being native to northeastern Asia.

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.

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