Physocarpus capitatus 1 Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus capitatus 2 Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus capitatus 3 Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus capitatus 4 Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus capitatus 5 Santa Barbara Botanic Garden, CA 130411 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus opulifolius 1 Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus opulifolius 2 Flinck's Garden, Bjuv Sk 140518 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus opulifolius 3 (cult) Dzukija, Lithuania 100714 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus opulifolius 4 (cult) Dzukija, Lithuania 100714 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus opulifolius 5 (cult) Dzukija, Lithuania 100714 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus opulifolius 6 (cult) Dzukija, Lithuania 100714 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus ribesifolius 1 Bergianska, Stockholm 050621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus ribesifolius 2 Bergianska, Stockholm 050621 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).

Physocarpus ribesifolius 3 Bergianska, Stockholm 050913 - Photo: Jan Thomas Johansson (© 2014 Jan Thomas Johansson).