Leaf helps in vegetative propagation in

Vegetative propagules are the plant parts or organs that are involved in the process of reproduction even though their primary function is not it. The reproductive process is called vegetative propagation as the non-reproductive parts/organs (leaf/stem/roots) are involved.

Bryophyllum is a plant group coming under the family Crassulaceae. These plants propagate by formation of buds on the edges of the leaf called leaf bud. These buds fall off and root wherever they land.