Wind pollination
These male (a) and female (b) catkins from the goat willow tree (Salix caprea) have structures that are light and feathery to better disperse and catch the wind-blown pollen.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Pollination and Fertilization. October 17, 2013."
http://cnx.org/content/m44723/latest/Figure_32_02_05.jpg
OpenStax CNX
CC BY 3.0.
