How are male and female flowers arranged on most Fagales plants?

Most plants in the order Fagales are monoecious, meaning each plant produces tiny flowers of separate sexes.1

These unisexual flowers are primarily wind-pollinated. The staminate (male) flowers are frequently arranged in hanging, chain-like structures known as catkins or aments. While the pistillate (female) flowers are sometimes also arranged in catkins, their specific arrangement can vary depending on the genus. For example, in genera such as Betula and Alnus, both male and female flowers are borne in catkins. In other members of the order, pistillate flowers may be subtended by a cupule or hull.12