Hanging male catkin and upright female catkins. Botanical garden Kumpula, Helsinki, Finland. Planted. 2010-05-21.
The copyright information is here.
Henriette's herbal is one of the oldest and largest herbal medicine sites on the net. It's been online since 1995, and is run by Henriette Kress, a herbalist in Helsinki, Finland.
http://www.henriettes-herb.com - Copyright 1995–2021 Henriette Kress.