Photo: Physocarpus opulifolius.

Branch in seed. Marketan puisto, Espoo, Finland. Planted. 1999-08-23.
Physocarpus opulifolius (L.) Maxim. Engl.: common ninebark. Deu.: Blasenspiere. Suom.: lännenheisiangervo. Sven.: smällspirea. Bot. syn.: Opulaster alabamensis Rydb., Opulaster stellatus Rydb., Spiraea opulifolia L.
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Photo: Physocarpus opulifolius.