A vascular leaf initiation stage (PO:0001051) during which a vascular leaf primordium (PO:0000017) forms in the peripheral zone (PO:0000225) of the vegetative shoot apical meristem (PO:0020148). [source: POC:Laurel_Cooper, TAIR:Katica_Ilic]
Comment
The vascular leaf primordium (PO:0000017) develops from the vascular leaf anlagen (PO:0025431).