Catkin
slim, cylindrical flower cluster with inconspicuous or no petals. an inflorescence consisting of a spike, usually hanging, of much reduced flowers of either sex: occurs in birch, hazel, etc From Wikipedia, the free encyclopedia
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A catkin is a slim flower cluster (a "spike") that is usually wind-pollinated but sometimes insect-pollinated. It has many flowers arranged closely along a drooping central stem.[1] Usually, it is unisexual.
It is found in many plant families, including Betulaceae, Fagaceae, Moraceae, and Salicaceae. The catkin flower arrangement has arisen at least twice independently by convergent evolution in Fagales and Salicaceae.
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