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Catkin-bearing plants include many trees or shrubs such as birch, willow, aspen, hickory, sweet chestnut, and sweetfern (Comptonia). [citation needed]In many of these plants, only the male flowers form catkins, and the female flowers are single (hazel, oak), a cone (), or other types ().
Catkins of the hazel (Corylus avellana)Betulaceae, the birch family, includes six genera of deciduous nut-bearing trees and shrubs, including the birches, alders, hazels, hornbeams, hazel-hornbeam, and hop-hornbeams, numbering a total of 167 species. [2]
The dioecious flowers are concentrated in inflorescences which cascade downward as aments of 4–6 cm (1.6–2.4 in) in length. [2] While it manifests separate male and female plants, the pendant male catkins are much more showy and are grey-green and up to 30 cm (12 in) long; the female ones are shorter and silver-grey.
catkin A spike, usually pendulous, in which the mostly small flower s are unisexual and without a conspicuous perianth, e.g. in willows, poplars, oaks, and casuarinas. The individual flowers often have scaly bract s and are generally wind-pollinated. Catkins are usually shed as a unit. caudate Having a narrow, tail-like appendage or tip, e.g. a ...
Female alder catkins after shedding their seeds Alnus serrulata male catkins. Alders are trees of the genus Alnus in the birch family Betulaceae.The genus includes about 35 species [2] of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few species extending into Central America, as well as the northern and southern Andes.
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The flowers are wind-pollinated catkins 2 to 3 inches (5 to 8 cm) long, the male catkins pendulous and the female catkins erect. The fruit, maturing in autumn, is composed of many tiny winged seeds packed between the catkin bracts. [5]