Catkin,
noun. A unisexual
inflorescence, consisting
of rows of apetalous flowers ranged in circles along a slender
stalk; the
whole forming a cylindrical, downy-looking, and generally pendant
part,
which falls off in a single piece after flowering or ripening; as in
the
willow, birch, poplar, pine, hazel, etc. (Oxford English
Dictionary)
Hazel Catkin
( Corylus
Avellana )