Physocarpus opulifolius, ninebark, is a shrub native to eastern North America; it is also occasionally cultivated for its interesting, peeling bark. The flowers are rather like those of Spiraea, and the carpels mature into follicles, as seen on the right.

Both photos taken by K. R. Robertson, the one on the left at the Arnold Arboretum of Harvard University, the one on the right at the Morton Arboretum, Lisle, Illinois.

Go on to next slide, go back to previous slide, or go to PB260 home page