It is also called as amentum.
In this, the peduncle is unbranched and grows indefinitely.
Flowers are numerous and develop acropetally.
Flowers are bracteates and sessile.
The peduncle is weak and hence the whole inflorescence droops or hangs down. e.g., Acalypha, Quercus.
In Morus the staminate inflorescence is shed as a unit after the discharge of the pollen.