catkin

n. long cylindrical cluster of small flowers without petals (found in willows, birches, and oaks, also called ament)

Catkins, or aments, are slim, cylindrical flower clusters, wind-pollinated (anemophilous) and with inconspicous or no petals. They contain many unisexual flowers, arranged closely along a central stem which is often drooping. They can be found in many plant families, including Betulaceae, Fagaceae, Moraceae, and Salicaceae.
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Noun
1. a cylindrical spikelike inflorescence
(synonym) ament
(hypernym) inflorescence

(n.)
An ament; a species of inflorescence, consisting of a slender axis with many unisexual apetalous flowers along its sides, as in the willow and poplar, and (as to the staminate flowers) in the chestnut, oak, hickory, etc. -- so called from its resemblance to a cat's tail. See Illust. of Ament.
  

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