Catkin
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A catkin or ament is a slim, cylindrical flower cluster, with inconspicuous or no petals, usually wind-pollinated but sometimes insect-pollinated. It contains many, usually unisexual flowers, arranged
Detail of a male flowering catkin on a willow (Salix sp.)
Etymology illustrated by pussy willow catkins from a children's book
Male catkins of hop-hornbeam (Ostrya carpinifolia)
Young male catkins of hazel (Corylus avellana)
Alder
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Alders are trees of the genus Alnus in the birch family Betulaceae. The genus includes about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north te
Catkin
…chestnut, and sweetfern (Comptonia). In many of these plants, only the male flowers form catkins, and the female flowers are single (hazel, oak), a cone (alder), or other types (mulberry). Corylus jacquemontii has male catkins and also female spikes. In other plants (such as poplar), both male and female flowers…
20120904Alnus glutinosa 01
Female alder catkins after shedding their seeds
Alnus serrulata male catkins
Pollen