Catkin


A catkin or ament is a slim, cylindrical flower cluster, with inconspicuous or no petals, usually wind-pollinated but sometimes insect-pollinated. They contain many, usually unisexual flowers, arranged closely along a central stem that is often drooping. They are found in many plant families, including Betulaceae, Fagaceae, Moraceae, and Salicaceae.

Occurrence

Catkin-bearing plants include many trees or shrubs such as birch, willow, hickory, sweet chestnut, and sweetfern.
In many of these plants, only the male flowers form catkins, and the female flowers are single, a cone, or other types. In other plants, both male and female flowers are borne in catkins.
In Britain, they can be seen in January or February, when many trees are bare for winter. They can even occur in December.

Evolution

For some time, catkins were believed to be a key synapomorphy among the proposed Hamamelididae, also known as Amentiferae. Based on molecular phylogeny work, it is now believed that Hamamelididae is a polyphyletic group. This suggests that the catkin flower arrangement has arisen at least twice independently by convergent evolution, in Fagales and in Salicaceae. Such a convergent evolution raises questions about what the ancestral inflorescence characters might be and how catkins did evolve in these two lineages.

Etymology

The word catkin is a loanword from the Middle Dutch katteken, meaning "kitten". This name is due either to the resemblance of the lengthy sorts of catkins to a kitten's tail, or to the fine fur found on some catkins. Ament is from the Latin amentum, meaning "thong" or "strap".

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