The female flowers of a catkin from the Common Aspen (Populus tremula).

Common Aspen

The female flowers of a catkin from the Common Aspen (Populus tremula).

"Male and female catkins of Betula alba." -Lindley, 1853

White Birch

"Male and female catkins of Betula alba." -Lindley, 1853

"Calamites (a restored); b enlarged fig.; c, d, e, leaflets and branches; f catkin; g root." -Taylor, 1904

Calamites

"Calamites (a restored); b enlarged fig.; c, d, e, leaflets and branches; f catkin; g root." -Taylor,…

A catkin arrangement of flowers.

Catkin

A catkin arrangement of flowers.

Tiny flowers or fruits, usually fuzzy and caterpillar-shaped, often drooping.

Pistillate Catkin

Tiny flowers or fruits, usually fuzzy and caterpillar-shaped, often drooping.

"The catkin of a willow, a type of spike."—Finley, 1917

Willow catkin

"The catkin of a willow, a type of spike."—Finley, 1917

A spike of unisexual flowers with no petals.

Staminate Catkins

A spike of unisexual flowers with no petals.

Filbert, hazel, and cobnut are all the common names of corylus. Illustrated are winter catkins of the plant.

Winter Catkins of Filbert

Filbert, hazel, and cobnut are all the common names of corylus. Illustrated are winter catkins of the…

An illustration of a juniper branch, vertical section of fruit (1), and male catkin (2). Junipers are coniferous plants in the genus Juniperus of the cypress family Cupressaceae. Depending on taxonomic viewpoint, there are between 50-67 species of juniper, widely distributed throughout the northern hemisphere, from the Arctic, south to tropical Africa in the Old World, and to the mountains of Central America

Juniper

An illustration of a juniper branch, vertical section of fruit (1), and male catkin (2). Junipers are…