Last Thursday's quiz showed a small tree with long yellow catkins.
Those were the male flowers, this is the female flower of the American hazelnut.
She's boring and small because she doesn't need to attract attention to collect pollen. The male flowers produce so much pollen for windborne dispersal that your fingers become dusty yellow when you touch them.
Thanks to Marcy Cunkelman for tracking down the other half of the pollination equation.
(photo by Marcy Cunkelman)