A leaf development stage (PO:0001050) which begins with the onset of the vascular leaf initiation stage (PO:0001051) and ends with the termination of the vascular leaf senescence stage (PO:0001054). [source: POC:Brian_Atkinson, POC:Laurel_Cooper]
Comment
In some plants, the leaf developmental stages may occur in the same leaf simultaneously. For example, leaves maize (or other grasses) have various zones where stages are occurring along the length of the lamina.